Should I let it go?

Both my girls do competitive cheer 7-12 ages. I pay an arm and a leg for it, but they love it. I do not like how the coach treats the girls on the team. She tells them to take a break because she can't stand to see their faces, or when she's frustrated, she'll tell them that their motions are ugly AF. She seems to not be able to handle her emotions when things don't go right. I want my girls to be motivated, and this behavior feels very discouraging, and I know it makes them afraid of her. I don't want to make things difficult for my twins. Should I let this slide? Say something directly to the coach or speak to the owner about my concerns? Looking for advice...