When I was starting a few years ago, I thought I would experience dangerous meetings, aggression, not paying...
But it turned out that the popular 'inconveniences' are different. Trying to get something from you for free. Your time, some extras, or things you don't do. They will be very manipulative. It's happening all the time.
I recommend you to say no and not to think about it. Good riddance, you got rid of problematic people.