They do know how to play the game, troll. One particular nasty woman (the worst I've ever met) used to talk about other dancers and how they 'weren't good' with her cronies. She would even talk about their physical appearance, if she thought they were overweight or some such. Some people wised up to her in the end and even the dance school had a word with her, but not until after she'd caused people to leave. My child was amongst the 'not good' apparently and I phoned the dance teacher to complain, it took a lot of self restraint not to approach her personally. The dance teacher said there was no point approaching her as she'd just deny it
Her own daughter was 'advanced' and 'ahead' and amazing, apparently. Newcomers would be informed of this within minutes of joining, but she didn't seem to do 'well' in exams or competitions or auditions (i.e. no distinctions, comp wins or selection at auditions, so I wonder if the venom was due to insecurity).
Anyway, this person is now at another dance school (she left the old school on bad terms and then lots of similar stories emerged) and is sweetness and helpfulness personified apparently, with the dance teachers lapping it up. I doubt she's changed, she waits until she's sure a person is 'safe' and has their confidence.
I hope this doesn't put people off. They're not all like that, the parents. I don't know how others have dealth with it, but I tend to give anybody negative a wide berth. Complain to the dance owners would be my advice, if it's not dealt with adequately find another school.