I'm sure it's because most of them are afraid they will experience sexism or have to deal with inappropriate comments. Keep in mind these would come from a select few and do not represent the majority on this site. The majority do not want blamed or labeled for the select few morons that can't behave properly. I have been harassed by other races and sexes in my lifetime and do not blame or expect those races and sexes as a whole to apologize or hold guilt for a few bad people.

I don't think there is actual chance for constructive discussions when comments like these come out. I'll drain the thread like the op recommended and welcome diversity like I always have.