Uhhhh, ok, if that's really how it went down, then I'm confused 'cause
there would effectively be two things I would do in this situation. Most likely I'd be trying to pound the dude's face in, but possibly finding an usher/security person to throw the guy out ... might depend on who I was with, random chance, and how big the guy was. 😃
But in all seriousness ... if somebody literally shoots beer all over my face on purpose, it's absolutely on. Not doing something about it puzzles and saddens me.