Kids who grew up in an environment where anonymous interaction is the norm (such as kids who have anonymous social chats at school, or do in-game chats etc) have grown so accustomed to it that I don't think they even see it as sexist, racist, bullying etc. Most would probably never say any of this to someones' face, not out of fear of consequences but simply because they know better. Yet in anonymous contact they don…
I partly agree, but it's also a bit of a cop out, to be honest. Anyone who has been in such an anonymous chat environment (game or otherwise) and has dished out such abuse has undoubtedly received it too and know how it feels. They do it because it illicits a reaction on the other end and they too have felt that reaction and decided they would rather be on the other end of it.
(With that said, there are certain behaviours e.g. support for fascism that seem to be associated with having large numbers of anon accounts.)