The sufferers are the ones who have to put up with people like that.
I was at a beer tasting night recently and the host in the bar was after people's opinions during each sample. This ******** kept being the first to answer with responses that made him look educated in the ale world, but just ruined the atmosphere for everyone else. Was meant to be a discussion, and given how flavour preference is subjective, his need to answer every time with more drabble got on everyone's nerves.
I guess we all do it at times, but there is some people who just can't control themselves. Nothing irritates me more than someone finishing my sentence when I'm answering a question.