Fuck, this is why I hate this "drinking culture" Irresponsible loss of inhibitions.
Does he get drunk often, or is it just for Christmas?
I get you, even if it's something they'd never say, it still hurts. Drunk people turn into temporary, overly playful sociopaths.
You're really better off not taking him seriously when he's drunk! Tomorrow, he may not even remember what he said!
Sorry for coming of as aggressive. Sending hugs!