Originally Posted by The Raven
He may have been doing a compound set with another movement or bodypart, or had to go get some water. Hydration is very important, and I often head to the water fountain mid-set. If someone happens upon the machine or bench that I'm working on, I'll wait til they finish their set, and I'll explain that I've got two more to go, and that I'll be working in. It's a gym guys, not kindergarden, it's okay to share.
For the most part I agree with you. But it does seem the other guy was being a little too aggresive.
I mean, if he had to tell him he had one more set, it is obvious the old dude was somewhere near the machine and getting into position.
A little courtesy, maybe a quick, "Hey, do you mind if I jump in first. I'm finishing up a superset."... "Thanks, dude." goes quite a long way. In the gym or not.
If some pulled that shit on me and just said, "I need to finish my last set." I'd probably tell him, "Sure right after I finish mine."
Like you said, its a gym, not kindergarten.