But it wasn't three people. It was her.
I have no reason to doubt her opinion based on her observations. Mainly because I have the same opinion. Parents who won't discipline their kids, don't make their kids work for anything, etc.
You see a kid running around a grocery store, playing with all the items, screaming. You mention something to the mother about her child and she replies, "Oh he always acts like that. I never discipline him because his dad and I feel that discipline restricts his creativity."
It would be a safe assumption that as the kid gets older, he is going to have problems listening to authority.
An opinion based on observation.
With mom, I can only assume (and do assume) that she saw something that gave her that opinion.