mirror selfie people. Or worse, people that don't use the mirror... just holding up camera in the middle of gym, snapping people in background without any consideration.
also people that drop 35 or 40 pound dumbbells from 3 feet off the ground when finished with their "set".
Look, i understand if you use the 90s and let them drop 12 inches after your flat bench presses. Failure, baby. But really, you're just an a-hole if you drop the lighter weight just because you can.