the biggest thing i hate is when you have someone putting huge amounts of weight on a squat rack or bech and dont even go half way. theres one specific guy at my gym who grunts and screams like he's trying to throw a car off a child with every set. i watched him do "squats" one day and was supprised to see him load up on 4 plates, but the he grabs two people to spot him and just barely bends his knees, then screams like hell to go 4 inches back up to lock out. he looked at me when he was done and said "i bet you didnt think i could do that huh?" i looked back and told him "no, i really dont think you can." a half squat is a half squat, dont tell me you squat 405 for reps when your not going all the way.
also i had some kid telling me he did 6 plates on a dip machine, i just looked at him funny. then he puts on 3 35s on each side and doesnt go all the way down.
i make some noise sometimes, but i dont try to act like some kinda hard ass, and i outlift 99% of the people in my gym. i think its funny when i see someone trying to get attention by making moise and glaring, when all i need to do is throw 3 or 4 plates on a bar to do squats or deads and poeple stop and watch. i'm not even that big and i'm not trying to say i am, but those tools irritate me.