It’s a dance class, stop being so ignorant of people who do not fit your cookie cutter stereotype.
Unless this is some fancy dance school that specializes in putting out Prima Ballerinas then I don't see what the problem was in letting the kid in. If it is one of those schools then they should have said to the parents, "this school specializes in training professional dancers and starts with kids at an early age. We are sorry but your kid just does not make the cut" There are kids with and without Trisomy 21 who are not going to make it if that is the case. If that was the case and they had worded it better then there would have been less hurt feelings.
How's that QM going for you?
Yes, it's a dance class.
Some dance classes are for just about anybody. Some of them are for people with real talent for the art of dance, who may well spend the better part of a lifetime practicing and perfecting it. Sane people realize that separating those two groups benefits both.
For decades, dewy-eyed leftists have been regaling American children with the idiotic notions that you can "do ANYTHING you want to" and "be ANYTHING you want to be". Stuff and nonsense! There's a good reason why I'm not an NFL quarterback ... and was never a Pop Warner quarterback either.