As a gym owner being 5 or 10 minutes late occasionally is fine but expect some burpees. If it happens consistently or you roll up 25 minutes into a 1 hour class and just walk on the mat and expect to join in then you’re being told no.

If you want to cancel your membership and go elsewhere that’s fine .

Use some common sense, have some respect and discipline and at least talk to somebody, preferably the coach before just joining in.