Really? I've never felt that way.
It's mostly on SPPF, the shipping section specifically. There are a few shippers that are well-liked by pretty much everyone, but they generally like non-mainstream ships as a rule. There are really two main categories of members there: people who support mostly popular ships (e.g., mainstream, het, and canon), and people who support more uncommon ships, or the opposite of what the mainstream-shippers like. I'm tempted to liken the situation to Mac vs. PC; there are the ordinary, boring PC users (mainstream shippers), and the hip, intelligent Mac users (non-mainstream shippers). Now, the maintream shippers are a large, confident group and they're generally well liked because they're just such a big, popular way of thinking, and they have their own cliques (Contestshippers, Pokeshippers), and the smaller amount of non-maintream shippers just seem 'better' somehow. I fall in the middle. My main OTP, the one I love most and am well known for supporting, is mainstream, and almost none of my others are. I don't support too many ships overall, but somehow all the ones I like conflict with the OTPs of the people everyone likes. I don't like Contestshipping too much, but it's far and away the most popular shipping on the site (it was for a while, anyway), but I like Rocketshipping, which happens to clash with the often favoured Kokoshipping, Blueshipping, or Yamushipping- all of the more popular opposing non-mainstream ships. So I don't fit well with the big group, and don't fit well with the smaller group, and that's not even considering the Pokemon x Pokemon and Pokemon x Human ships. :\
Call me crazy, because I honestly can't believe I take the fanbase this seriously, but I really liked posting in some threads and just don't feel like my opinion would be very welcome. Heck, I could be misreading things altogether, but thats really how it seems to me most of the time.