Oh Jules, I used to have a housemate like your sister who would constantly give a running commentary on how someone looked on TV. It was the very first thing she said as soon as a woman appeared. And this was from someone who would bag men for judging women on their appearance!

So I told her off and said how can someone who calls themselves a feminist be so OBSESSED with other women's appearance? I mean, we all notice (let's not kid ourselves here) but to go so far as analysing/judging/talking about it and spending that much of your day doing it ... I don't get it.

She seemed genuinely surprised ... maybe she didn't know she was doing it. Perhaps tackle your sister on this first (with your DF's support) - just say it's a really boring topic of conversation.

Anyhow, needless to say, my housemate didn't stay a housemate for long.