A couple of things. You said he's moving out West in 10 months, so that's a good thing--at least you won't have this insanity in your home every weekend.
The other thing is that I just noticed what you said in your OP about posting about it on FB. Bad idea, IMO. It's not your job to shame him by publicizing it on FB, and it is likely to create huge resentments, as well as doing no good (and possibly making things worse). It's different to post about it here--we don't know him and can't judge him--but other people will. If he continues as he has been he will have consequences soon enough.