Here's the problem I'm seeing, Scherezad. What you're really objecting to is a judgmental streak that exists in a large percentage of humanity and reliably appears in pretty much any group, especially well-established ones with their own customs and mores. It's objectionable, I agree, but it's hard to control. Usually the most you can do is establish rules of civility for a given forum.
That's what this forum, Backstage OOC, is for. Outside of it, people will bristle at being told to tone down their language-- "circlejerk" has the unfortunate merit of describing the speaker's opinion of the subject with much better accuracy than, say, "clique." Preventing people from expressing themselves thus vividly is sort of a non-starter in internet culture. More to the point, preventing the use of the vulgarity, "circlejerk," will not change the speaker's opinion, which will continue to find expression through other means, since the speaker continues to think of the "circle" as a "mutual masturbation society" or "joint manual pleasuring group." Less vivid expression may lead to better clarity as to exactly what the issue is ("an incestuous clique that exists for no reason but to aid and abet its members' vapid RP"), but won't make the judgment any less harsh or unfair.
At an individual level, the two approaches I can see are (1) engagement, which means arguing against the opinion rather than the language, and (2) avoidance, which means just staying away from the whole nasty mess.
I'll apply (1) if I actually give a damn. Introduce nuance, suggest other perspectives, maybe very gently hint that the speaker's judgment is at least a bit unfair. If you're gentle, you can usually get them to back off at least a bit, but don't go for the vulgar language; go for the vulgar opinion behind it.
However, having been involved in internet RP for the last decade or so, I've long-since given up trying to fix communities as a whole. With immense effort, you can become a beacon of wisdom, a respected figure within the community, and still people will be horrible to one another. The only way to really avoid it is to engage in (2): to avoid it.
I like you guys, all of you, about as well as I've liked any group of roleplayers, but I don't play this game for the OOC social interaction. I don't care all that much whether you think X is a good roleplayer or Y is a drama whore. I can make those decisions for myself, and I grew sick years ago of trying to convince specific people that other specific people aren't wastes of air. Backstage OOC is substantive enough and low-drama enough to hold my interest and make me willing to actually engage, but otherwise?
For the most part, all I want is to play my role. Getting involved in the OOC drama on any real level gets in the way of that, and I always end up getting my fingers singed when I get involved. I'll mentor new players and offer the odd bit of advice, but as far as the OOC social conflicts go, I prefer to be Switzerland.