Mostly no, if it's a gaming or pop culture based avatar that is ultimatley not confronting or generaly neutral then I have no problem with it. If someone has an avatar that descends from say Firefly then it merely says that they liked Firefly. I mean my avatar says quite clearly that I am a fan of Halo and of the elites but it isn't confronting (except for the obvious confrontation of gazing into the face of the holy Sangheili) and so it's more of an expression of what one likes and in a sense a definition of who we are.
Then again I remember joobnook47... the first (or second) incarnation of the resident troll had that avatar of Gordon Freeman killing Masterchief and I was not in the least bit surprised to find him as an endlessly annoying Halo Hating Troll. So yeah, he was a guy I hated flat out mostly because he openly insulted me and quite a few others based on our mutual like for Halo.
Then again I remember joobnook47... the first (or second) incarnation of the resident troll had that avatar of Gordon Freeman killing Masterchief and I was not in the least bit surprised to find him as an endlessly annoying Halo Hating Troll. So yeah, he was a guy I hated flat out mostly because he openly insulted me and quite a few others based on our mutual like for Halo.