WOW - it's called dark humor. Think someone mentioned it a few pages ago, though they mentioned it was just akin to law enforcement. Funny, I was raised by a cop, so maybe it is just a law enforcement thing.
Anyways...
Well, I'm someone who told her trainer "no" when asked to do an exercise post c-section that I didn't feel physically capable of doing at the time. I know my body and I didn't want to get hurt. Ironically, I began doing GHD sit ups for the first time in my life 5 weeks post c-section, so that was not the exercise I said no to. Was I stupid about it? NO. Sure, I was strong before getting pregnant, but still. There is a risk in ANYTHING you do. GHD sit ups are not the devil people make them out to be IMO. In fact, they helped stretch out my scar tissue! :-) And, for the record, I don't train at a box.
If I were that hypothetical newbie, I'd have asked the trainer to just punch me in the face repeatedly for 10 minutes instead. Then, I would have asked for my money back and left. But, maybe I was raised to possess a different mindset than most? I do not believe in being a victim, see. And I also analyze and question everything.
Just do your research people. Take up some responsibility as well. But are there stupid trainers out there? Hell yes and some are reckless.