The take away of the last few years of the internet is basically:
(1) Being able to be extremely racist, particularly using the N-word freely without social reprocussions is really, really important to some people. Some folks just don't like minorities, especially black people.
(2) Some dudes have real problems with women in general, and even more problems with women in positions of authority (either in general or over them). It's impossible to look at this as anything more than people projecting their insecurities. Really. Every guy who goes on about "feminism", I just want to ask "okay now tell me about the woman who friendzoned you" or something. That, and it starts at home. Guys who say shitty things about women probably saw their dad do it or something.