re: What would you do in this situation?

Why should I have to let him work in between? There was only about 10-15 people in that section with over 50 machines, benches, etc. and when I went over to the squat racks at first they were all occupied. So I decided to stretch and do some GHR and wait till one of the racks opened up. During that whole time, and even after I got to a rack, the assisted squat racks were all available. The gym was not busy at all. I just didn't want to share the rack because a) I like working out alone (which I said to him after he persisted that I let him use the rack b) I waited for the previous person using said rack to finish, and c) he just walked up and assumed I had to share it with him, then got butthurt after I told him no and explained I would be done soon.

About 60-90 seconds in between sets, and it was with low weight. Nothing crazy about wanting to do 4 uninterrupted sets imo.