For me personally my issue it's I go to a small gym and when I got there it was empty late at night so I was using two machines alternating. The gyms weird dude also happens to come around this hour and one of these two machines is the one he likes to hog for the whole time he's there whenever I see him, so I tell him I'm almost done with my last two sets.
I walk to the second machine and start working out, he comes and removes my shit from the machine I was using, wipes it down, and starts alternating himself between his two classics like if I wasn't literally right in front of him looking at him with a "did you fucking seriously?" face.
I have no right to the machine, but on small gyms in particular there's more of a sense of respect and community between members. People sometimes grab two devices not necessarily far away and folks always ask if you're done with one. If not you do something else.
So yeah. This weird dude is on my shit list now. If he ever asks me for a favor lmao.