1). If there’s a serious lifter (you know who they are) working a station and you’re just doing 10-pound benches or sitting at the station ogling women, let the hulk work through. He’s serious about his regimen; you’re just there to fool yourself (and you know who you are).
2). Don’t vocalize. It’s okay to grunt and groan a little, but unless you’re pumping for Mr. O, nobody is impressed with a lot of ninja shouting.
3). Clean up after yourself. That means wiping down the equipment and reracking the weights. Nobody there is your maid.
If you are woman check you attire before you go to the gym (using a mirror), but do not give me dirty looks for checking you out when you bend over and your black tights become transparent.
Funny story - I used to have a female friend who not change in the women’s locker-room because she claimed there was this cabal of women who always hang out totally nude.