Create a fight thread, (Fight Corner) where this is the only place you can swear, be abusive, say what you want, doing so anywhere else, temp/perm ban, this'll clean the site up of useless garbage from 'clean' user's.. obviously mark it with xxx, since tit's like vod like putting up porn picture's, which should really be banned.
FWIW OP is conflating two issues (at least). Saying things like 'fuck me sideways' or whatever is not the same as being abusive. Being abusive has no place anywhere really.