That’s because they hadn’t gotten to know you yet. While you are still a new member I can see them giving you the benefit of the doubt and trying to help you out in the interest of good customer service. After a while some customers prove themselves to be magnets for confrontation, and when their hijinks and complaints become more trouble than the cost of their business is worth, they’ll get kicked to the curb. Give it a while and it might happen again at the new place if you insist on creating problems.
It sounds to me like you weren’t ‘demonized’ for your parking lot vigilantism (although I’m sure it didn’t help matters), it was just the last straw for the gym management, who had become intimately familiar with you and decided that they had had enough.