Homophobic language on the playground? I don't think I even knew homosexuality *existed* until I was in late high school. Maybe college.
In the UK, and I think I understand also in the US, this is a big issue at the moment. See
this page about tackling it for example, with quotes such as "95 per cent of secondary school teachers and three quarters of primary school teachers report hearing the phrases ‘you’re so gay’ or ‘that’s so gay’ in their schools". I'm sorry to say that my DS has encountered it, and even sorrier to say that I suspect he has encountered strategic deafness in the teacher who ought to have been stopping it, too.
[ETA: it may well be that many of the children who are using "gay" as an insult do not actually know that the word means homosexual, may not even know that homosexuality exists. That's why I wrote "homophobic language" rather than "homophobia".]
