I assume one of the big reasons people aren't protesting against Rotherham is because if you organised a protest exactly the people who were on yesterday's march would be screaming 'raaaaaaacist' and hounding the organiser out of their job and home, harassing them and their family and organising violent counter protests.
And it's not like they really care about sexism. It's just a convenient stick to beat their political opponents with. Because of course they are prepared to turn a blind eye to Bill's unpleasant activities which go far beyond a few off colour comments, and Hillary's vileness to the same women. And the unions in this country have a terrible problem with sexual harassment, sexual discrimination and sexism. And despite all their posturing the Labour Party has a notoriously macho culture and hasn't even had one female permanent leader whilst those terrible regressive Tories have had two female PMs and a female Chancellor.
Basically it boils down to the fact that sexism is all fine and dandy if you belong to their favoured groups but if you're an opponent suddenly they're all hot and bothered about it.
Incidentally JFK, who is a democratic hero, had an appalling attitude to women even allowing for the different standards of the day. But he prevented nuclear Armageddon, abolished the federal death penalty, made huge strides forwards in civil rights, invested in public services and made moves to prevent nuclear proliferation.
But by today's standards he would have had the bum rush straight out the door. Although he was a democrat so they'd probably just look the other way.