I ignore most of them but there are a couple of types that get on my nerves. The fuktards that do 3 or 4 reps on a station and then jump to another, constantly getting in the way. Its hard to ignore them.
Then there is the dude that wants to tell people what they are doing wrong. He looks like a weak tennis player and probably has a middle management job at Best Buy.
I do like the young girls that stare at my cock in the mirror while I do curls, that is flattering for an old fuk like me.