@bimkom I agree with you entirely. It occurs across the board, outside of education too. Only a few days ago my partner had to 'tell off' a small group of young people at work for making inappropriate comments circling the type of behaviour we're talking about here. Albeit none of the comments were directed at another staff member, however would have been quite offensive to others outside of the (not so funny) "joke" they were having.
That aside, I do wonder if this type of behaviour in our country's schools will drive up demand for single sex education. My DS is at LU, however, friends with DSs in the Guildford area all send their daughters to the private single sex options and swear by it. Their geography helps too, with most parents spread out over the Guildford area or countryside, parties are less easy to organise on a whim and meet-ups in groups outside of school hours nearly always requires parental transport, thus are usually supervised. Inside the classroom they always rave about how the girls get to do take part in every leadership/sport/academic/drama/etc role going and not worry about being 'trumped by boys'.... which I always rebuff as a bit of a overreaction (being a mum of boys myself, i think they're wonderful!), but none the less its what they think and it it seems to work.
In my mind i'm certain that separating our DS/DDs doesn't address the core issue of teaching proper social etiquette and appropriate behaviours!
Anyway ramble over!