Since Irishman mentioned gym:
At the other gym, I hate it when young people plop down on a machine and then fiddle endlessly with their smart phones. Also hate it when people sit on the stationary bikes to sit on while they watch TV.
This right here. I couldn't stand it when people would monopolize machines. Or they'd grab all the free weights they needed and if you needed what they had, "they were using it" while it's clearly on the ground, not being used. These entitled people who feel their workout is more important than yours. Or the people who as you said, just sit on a machine and NEVER get up! I don't lift anymore as I switched to cardio so I don't have as many problems now (knock on wood). But I feel your pain sir!
