I read this really interesting blog post by Ragan Fox

( http://ragan.wordpress.com/2011/03/06/eating-our-own/ )

Itt gets kinda academic in its language but his basic point is that when it comes to minorities people except them to to embody everything good in the world and when they don't (as nobody does) they are unfairly criticized for the failings that everyone has and held up as an example as another terrible minority. Whereas people who aren't in a minority (straight, white etc.) are allowed to fail and have character flaws and nobody says it's because they're straight, white etc.

This of course applies to everyone, but he believes it applies even within the gay community and that could be why gay people love to rip each other to shreds slightly more than you'd expect.