Is this normal behavior for men?

I've recently started playing an online game.. And there's a group of people who play daily that I've been avoiding. Basically, they say random inappropriate words like (private parts). The ones who say it are men, and I found they don't say it when their female friends are there. So.. Is this normal for men to act this way? I mean.. Idk.. I also deleted a friend biz I found he hangs out with them and shouts random perverted things.