Some people seem to get annoyed(give me looks) because I might pace or stand around when I'm waiting for the bench of squat rack to open. As if they are mad I'm not totally engaged in an exercise at all times.
My favorite are the older women who hang out all day at the shake bar, just to flirt with the younger guys. they will do 5 minutes on the treadmill, hang around flirting for 20 minutes, do 5 minutes on the elipical, repeat.
Can't stand the guys with their earbuds in who sing out loud as if everyone needs to know the awesome music they listen to.