My greatest fear about death is that hell will be a small room where everyone inside does nothing but argue about stealth over and over again, until the rapture.
But seriously, the anti stealth sentiment - if you believe it exists - is probably just an inevitable product of how the trans community builds itself. Basically, you have two kinds of people who come into it. (This assumes everyone "enters" at the point they realize they are trans.) The first are the ones who, for whatever reason, won't be stealth at the end of transition. The second are the ones who will, eventually, manage it. Both basically start the same and have a lot in common. At this point, you don't have any conflict.
But, when you get to the point that both hypothetical types of people reach the end of transition, it changes. The people who are not stealth still feel a strong connection to their, err, "trans-ness". Whatever you wanna call it. So, they still think about it, still feel like talking about it, etc. So they remain on the forums. On the other hand, the people who go stealth have the opposite effect. The culture, types of conversations, and whatever, get boring, because it doesn't really connect to anything that happens in the "Real world" anymore. So, eventually, they bail out of boredom or some arguement and don't feel a complusion to return.
Thus, in the long run, you have a community that has a strong built up amount of out people, but only a passing in and out group of stealthers. Which leads to the overall melting pot not really "Getting" them. Which leads to topics like this, which just serves to bring out further the sense of dissonance stealth people get, which sometimes makes them hostile and appear elitist, if they don't just leave even faster.
That would be my theory on the whole deal, anyway. If trans support sites would stop breaking into debates over the same topic over and over and focused on helping people transitioning instead, both groups would probably stick around for longer.