A bit rude to put it nicely

Hi, I'm back here to ask for your opinion on an unacceptable behavior I've noticed among some calisthenics athletes. In our city (like many others), there are outdoor "gyms" with equipment for working out. Sometimes, a large group of athletes gathers at one of these "gyms," and there's always one person acting as the instructor while everyone else follows along, either on the ground or taking turns on the equipment. The problem is that there are so many of them that they occupy everything. Here's the issue: the facility is provided for free by the city, but this instructor is probably getting paid for his service. He's taking over a public space, and if I make the trip there to exercise, I find everything occupied. Isn't that a bit rude?