The most annoying for me is when some bigger guy leaves way too much weight on a bench press and just expects others to take it out. Sorry, but I don't want to tear my muscles, and plus I always have to take all the weights off because the heaviest ones are on the inner part. Also, I hate guys that parade around naked in the locker room. So you have a penis, big deal, mine is bigger. Only girls want to see it, not a whole bunch of guys. Only place you should be naked in the gym is in the shower, and eyes should never go lower than the ceiling.