Come on folks, let's be real. If the OP went next door himself, no matter how he asked, do you think the party goers would honestly take his request seriously? Really? At best, they'd turn shit down for a minute or two and then immediately go back to being loud. Why would they give a shit about what he wants? They're having fun. They're drunk. Nothing matters to them, in that moment, especially some dude next door. If I was piss drunk, I can guarantee that I wouldn't give a single fuck about what anyone else thinks.
The OP asserted himself and said to hell with this shit. He didn't call the cops. He didn't ask for other RAs to get involved. All he wanted was for people to be less loud, in the middle of the night, during quiet hours, so he, and others, could sleep. He went about it in the most effective but least shit headed way possible. But apparently, that makes him an asshole. No one can win here. You're either a selfish, self entitled passive aggresive snitch, or a passive, bitch made door mat. It's fucking disgraceful.