You could try a hippie/anarchist commune, if there are any left. There's also the world of music and entertainment, like somebody already said. And George Orwell reckoned that tramps are normally very non-judgemental.
Maybe the quickest way is to screen out any homogenous group......people have to be able to recognise normal behaviour in the homogeneity of their group before they can notice who is odd and who isn't.
Just do as I do and gravitate towards the weirdest people you can find, and you should be OK. Though weirdness may be in the eye of the weirded-out, so just because somebody is weird, it doesn't mean that they won't see you as weird by their standards. There are so many flavours of nonconformity, and they're as different and hostile to each other as SWP and BNP.
There are lots of us who know perfectly well that it's pointless to judge anybody who isn't an actual threat to us, however strange they may seem. Unfortunately, I've never found a whole group of them....like prophets, seers and sages, they tend to be loners.