Scootaloo has just noticed the difficulties of being a child. Like if a grown pony does something wrong, then she has no right to criticise. But if she screws up, then everypony has the right to criticise HER. Also, when under the authority of others, supposedly grown ups, she can't do anything she wants without permission. Adults also happen to think children are naive beyond compare.

It's almost as if they forgot they were children themselves!

Now, that she's noticed it, she must live with it, if she doesn't rebel first.