The Minmatar tribes draw a lot of tropes from third world cultures seen today, mainly Africa, but also various other native cultures that today got more or less embroiled in the current globalization climate. It is only natural that people start first to take it as face value, and will try to picture african tribes, maori tribes, amerindians or everything with a strong either third world slum aspect, or either a strong alter-globalization with a hint of new-age/hippie sugarcoat about drum circles and native cultural fads.
The fact that especially early PF pictured the Minmatar with at least some of those tropes, like they don't tend to wear much clothes compared to everyone else (cf old chronicle illustrations about tattoos, or the Ray of Matar chronicle), especially when involved in their religious or traditional rituals, as well as simply showing their tattoos.. Well, it also doesn't help in that regard.
The Minmatar are not so easy to play since like for the Amarr, you have to conciliate a very alien culture to ours with strong native/medieval undertones that are easy to make, with a modern futuristic setting. I often see the Minmatar a bit like what you can see in the runner underworld of shadowrun, with their shamanistic rituals, scantily clad people full of tattoos and punk attitudes, but literally bathing into technology. Not that it has to be exactly like that, mind you, but I think it is a good example of blending native traditions with cyberpunk settings. And that is only for the plebs. Now then, it is even harder to do so with the upper classes and politicians. Probably a lot of inspiration to draw from indian traditional garbs and manners embroiled into modern politics.