I also believe everyone should be equal, but they are angry for a reason, and it's not like straight white cis guys will get hurt by their anger other than being offended. They don't ACTUALLY think they are better, they are just trying to relieve their anger in a way. Nobody gets hurt, so who cares? I do agree that death/rape threats to straight white cis guys is a bit too much though, and it does happen on tumblr.
Anyway, but if the thing you see on deviantart is written by straight fangirls... Then it's just plain fetishizing of homosexuality and it's wrong.