A co-worker has made this same mistake for the last couple of years working at our company. He complains about everything and doesn't try to fix anything himsel

A co-worker has made this same mistake for the last couple of years working at our company. He complains about everything and doesn't try to fix anything himself. He's a smart guy, though. He's bitter about some treatment he's received but still...complaining is what he does. Now he is being pushed out of our group by the original management from before when we got acquired. Not sure where he's going now but he's out. He'll never advance and I'm sure this is somehow noted in his performance reviews; technically he got bumped down a notch. He's probably really bitter now.