social assassin

An unabashedly blunt person who is your go-to man to convey to a friend, relative, spouse, lover or acquaintance that they consistently do something that is so very annoying.
This term was used by Jeff Garlin to describe Larry David in Season 8 of Curb your Enthusiasm when Larry is propositioned by a friend to tell his wife that her using the expression "LOL" is extremely annoying.

Dave - How can I tell Claudia that her breath smells so bad that I can't even give her a ride home after class?
Tim - Jose will take care of that for a bill. He's a social assassin.

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