I'm not going to re-rack the weights on my machine cause someone else filled up the weight holder on mine mid-set
Wow that sounds annoying. Why won't you do the right thing?
People who break gym etiquette deserve shit
I understand someone not practicing common gym etiquette can be pretty infuriating. It's rude to outright mess up the weight racks for someone on purpose, if you have an issue with someone at the gym you should bring it up to the manager or talk to the person. Attempting the sabotage the person's workout could result in you getting banned from the gym.
Nah, it will teach them that they can't get away with breaking the gym rules and that no one cares.
You still need to follow the rues even if someone else breaks them. The manager can view the cameras to see who is breaking the rules. Revenge is no way to get what you want.