Grypochondriac
A person who can't help but find something wrong with every person, place or thing, and can't stop talking about it.
Guy #1: "While my buddy and his girlfriend were on vacation last December, he actually got the OK from her to hook up with three chicks that looked like they were from the Swedish Bikini Team."
Guy #2: "Oh man, I bet he brags about that all the time."
Guy #1: "Nope, all he's done ever since is gripe that there wasn't a brunette in the bunch. Nothing makes that guy happy. What a grypochondriac."
Guy #2: "Oh man, I bet he brags about that all the time."
Guy #1: "Nope, all he's done ever since is gripe that there wasn't a brunette in the bunch. Nothing makes that guy happy. What a grypochondriac."