This wasn't the Cookie Monster that lives on Sesame Street, but the one that hangs out on Times Square. It seems a man in a Cookie Monster costume got mad at a few parents for not tipping him after they took a picture with their kid.
The man in the Cookie Monster outfit wasn't even asked to have his picture taken with the child. He just grabbed the kid and then demanded money. When the parent told him they couldn't tip him, he shoved their child!
Cookie Monster was quickly arrested.