I don't discriminate but it bugs the crap outta me when two people have the same avatar, unlikely as that is on ANY site, but less common on here than other sites I'm a member of.
Yessssss I rather DO like me some gifs because often I become mesmerized, especially if the subject matter is something I like or the loop is flawless. Yes, everyone's said it, I get a little annoyed sometimes as MLP avatars, but that's only if they're going on some speal that just makes them look dumb - i.e. Judging a book by its content, instead of the cover; they could have an avatar of Aristotle and I'd just end up feeling sad that they have such an avatar only to spout nonsense.
So no, I don't think there's much (if any) discrimination purely for avatars, though I won't blame a man for thinking of a group of avatars negatively for their mostly negative behaviour in forums.
And I like making my own avatars, that way if I HAPPEN to see someone else with the exact same avatar, I can lie in smug security that I had mine because it originated with me