Man has a point.
I disagree.
I do not think that anyone in this thread is arguing - or has argued - that western culture is superior in every aspect. That would be, one might say, more along the lines of imperialism and racism. No, what has been argued is that certain aspects of western culture are superior.
Culture, is, perhaps, a bad word. Not a dirty word, but not a very precise one, rather. When someone says "culture", they are referring to the entire behavior set of an entire group of people, a behavior set that is not entirely homogeneous in practice. For example, I could speak of "Californian culture", but the fact is that, in a 150-mile radius around where I live, there are Christian fundamentalist communities, college communities, conservative and liberal political communities, suburbanites, perhaps some urban African-American communities, and some rednecks (who would be proud to be called such, at that)...and that list is grossly unfair to the multitudes of others I omitted.
Good luck finding beliefs or practices they all agree on.
Yet, out of America, certain ideas and ideals, languages and practices, methods and religious observances, are dominant. This is, as it were, our culture.
Can we say that a culture is better, or worse? Not necessarily - to say that
a culture, in totality, is better, is to claim that it is better overall for the majority of people living in it. Can this be determined?
Yes, if one can accept that there are objective ways in which humans can be better off. Can we say that there are such objective valuations?
Yes. Health, for example. If food is a part of culture, certain diets are better for you than others. If certain actions and mental states make you feel better than others, then cultures which promote more positive actions and mental states will reduce the likelihood of you being miserable. Should one value being not-miserable?
Well, when asked this, I tend to resort to Sam Harris's argument: imagine a world in which people are as miserable as possible, for as long as possible, before they die, as miserably as possible. This is the worst of all possible worlds. We can imagine situations close to such a world. We can also imagine things which are further away from such a world. And, by definition, there is no reason to move towards the worst possible world. Even if you wanted others to suffer, the worst possible world would involve that suffering without you getting any pleasure in it.
If morality has anything to do with anything concrete, then it consists of this: avoiding and moving away from the worst possible world for everyone. If that is true, and it is, then it is possible to make value judgments about what things move people further away from the worst possible world. It is possible to scientifically evaluate whether things like homophobia, murder, trustworthiness, theft, diligence, blackmail, and honesty contribute or detract from moving away from the worst possible world. Just as we can evaluate whether eating fatty foods leads to heart attacks, we can evaluate whether such things as placing women in cloth bags or the Westboro Baptist Church are good for human societies.
I trust no one will disagree with my assertion that the ideals of the Westboro Baptist church are not likely to be a good influence on the happiness of human societies.
More abstractly, suppose I construct a society, its elements derived entirely from real world cultures at different times and locations. This culture is known as ABC, and its favored dishes contain massive amounts of cholesterol, trans-fats, and sodium. Drug use, especially alcohol, is considered socially acceptable and even encouraged. Women are considered sub-human, and are not allowed to testify in court or to act without the permission of a man. Gays and lesbians are executed by stoning. Child sacrifice is an essential part of the religion, along with self-flagellation and both female and male circumcision. Weaker children are left to die in the elements, and medical care consists of hoping you get better.
Contrast this with, say, modern Denmark (I do not live in Denmark, by the way). Would anyone here seriously advocate the view that ABC is either morally or practically a better society to live in? Would anyone care to argue that ABC is a place likely to contain happier and healthier citizens? Yet, both are cultures.
Would a person who advocated the replacement of many of the values of ABC with the values of modern Denmark be racist? Well, they might be, or they might not, but in either case, the citizens of culture ABC would be objectively better off over time if they were to abandon many of their cultural practices.
Let us return to the real world, now. Is it true, therefore, that some cultures should be replaced wholesale with others? No! There are portions of any culture which have no great bearing on human well-being, and portions which are positive. For example, I might say that Americans should eat more like Japanese, or adopt a more Mediterranean diet, because those are healthier. That's not a claim that Americans should completely abandon everything American, it is merely pointing out that American food is some of the least healthy on the planet.
Similarly, a demand that Iran stop hanging homosexuals is not a demand that Iran adopt, wholesale, all the values, practices, or ideals of the west. It's a demand that they adopt this particular ideal, because it is better for everyone. Is it better for everyone? Yes, if one examines history, sociology, and other sciences, one comes to the conclusion that gays and lesbians do not have negative effects on society, and that killing off your Alan Turings and Marlene Dietrichs is a bad idea. For everyone. Even if you can convince everyone that killing gays is a good thing, the fact remains that you would be better off convincing everyone that it is a bad thing.
You don't need to have such concepts as "human rights", or "individual rights". All you need is a preference that people not suffer any more than is strictly necessary. That such a preference results in many western liberal values is simply a brute fact. And some non-western values, such as care for the elderly, certainly align with a preference for reduced suffering. It's not that westerners are special. It's just that someone had to get them first - that the cultures which advanced fastest towards these preferences also had greater access to water transport, relatively high agricultural productivity, and contact with many other cultures from which they could get ideas, is almost certainly no accident.
People are not that different around the globe. Virtually none of us like being sick, getting killed, or watching loved ones die. Insofar as these conditions obtain, and insofar as cultural attitudes, ideas, and actions have bearing on them, there will better and worse approaches to these problems. Just as a culture which values using sledges to carry items will be less efficient at the transportation of goods than a culture which prefers wheels, so will certain cultures be better at ensuring greater happiness and less suffering for the biological machines called humans which make up these cultures.