I read that as: Creontes are not bad people. There are real legitimate reasons to leave a gym, presumably, reasons just like those he has given us (you know, not getting invited to bbq's and what-not). Anyone who doesn't understand that is just naive. Instructors don't deserve undying loyalty for showing you a few moves, and all this talk about loyalty and creotes is just a tactic to keep the sheep in line.
That's my reading. I am highly practiced at deciphering nonsense, so this is probably what he meant.