Inspired by some ornery, and I presume old, bittertons that frequent a couple of sites I enjoy reading and posting to, I have decided to coin a new phrase. Ladies and Gentlemen, I give you "bitter bombing."
Definition: the curmudgeon’s online equivalent to glitter bombing. The act of attacking someone or their post on a blog or website comments page without warning or provocation just because you’re a bitter old bastard that has absolutely nothing constructive to add to the discussion and you enjoy being a complete dick.
Usage example: We were having this really engaging online debate the other day until that douche bag “4skin” showed up and begin bitter bombing everyone. Yeah, that pretty much killed it off.