Am I the only one who has noticed in the last few years that no one lets you work in on a machine with them?....I see these Millennials and Gen Zers, and even some old folks that know better, SIT on the same machine for a half hour.....looking at their phones....ridiculous....get up and let someone else get in a SET !!!......Back in my day......
Are you asking if you can work in and they are saying no, or are you just sitting there staring at them?
In all my years of gym going, unless I'm trying to work a circuit, I don't know that I would get up and leave a machine/rack/bench and risk basically losing it to someone that wouldn't let me continue working in, nor have I seen someone else leave where they are working inviting someone to step in when they are between sets.
But if anyone asked to work in with me, it's almost always a yes as long as they are able to keep up, ie working at a similar weight level, and same pace of working set and rest period.