I have fought racism and sexism on Frothers and elsewhere. I fight it in the streets and have feared for my safety more than once in doing so. I am not a brave man nor a very physically imposing one. To stand up to people scares me, I do it anyway, as and when I can.
I am also a human and have a family. I cannot fight all injustice everywhere all the time, I am mortal and need a rest. It is also especially hard when given what I do that people punish me for it. If I did not defend them, consider that I stopped trying as people like you make it just too hard. Why try to help people when you are punished for doing so?
Also, please get your facts right.