AITK,for asking person to work in (alternative set) in the gym

I go this small gym in tier 2 city, i usually go around 5:45, so we have 2 floors to the gym, one is for cardio and other is for weight training. I was 3rd guy in the gym Today morning, after warning up, i went upstairs to weight section and found still locked, i went down brought the key, unlocked the door. By the time I came back, i found the other two people had already taken up the bench press. They were 2 people, after wating for 5 min, i asked them if we could alternative sets, they were like no, I was like fine, they almost took 20min and did like 6 sets of 12 reps each. Once I got hands on the equipment they were others who were waiting for the equipment, so I and other person did alternative sets on the machine, later I was almost done with all the exercises, only thing left was tricep push down, it was again those two guys hogging up the cable machine, i asked them again can we do alternative sets, they denied, again i didn't mind, they weren't wasting time, but they doing like 3 different variation and 3 sets each* 2 people, so it was like 18 sets all together. This where I snapped I asked them to let me do i set in between, they were like you need to come early, we came early so we have the right, if you want you could go and talk to the trainer, i am the kind of a guy who very much confrontational but today was the day, i felt like, I needed to speak up. Amitk for speaking up.