Society is crap
I wish the people running online communities would just accept the fact that society in general is full of bigots, racists and misogynists and stop trying to take responsibility for them.
So you pulled a large group of people together and some of them (maybe a larger than average percentage, depending on yor target demographic) turned out to be assholes. It's not your job to modify these people's behaviour, it's society's job (i.e. the rest of us).