You should keep it to yourself.
Instead he spreads his unfunny furry comics everywhere and then claims he created an avatar fad which only 2 other people used.
You don't like his avatar? Don't look at it.
You don't like his topics? Don't read them.
You don't like his forum copy? Don't go to it.
Anything he's doing is not adversely affecting you in any way. Stop being a richard for attention.