@Momofkids,
Yes, you are wrong.
First of all, most businesses are set up to clean up messes. This is expected of businesses now, and it is probably better for them to do the cleaning themselves (they will want to make sure that their protocol is followed).
Second of all, there is no benefit to you judging other parents. It doesn't help them, nor is it good for your own mental health. This didn't concern you at all.
Live and let live.