Gross! I wouldn’t want him to put anything back, only heaven knows what someone might catch!
I would definitely go back and emphatically complain to someone higher up the chain, tell them they won’t get my money if this is what they allow (including the neglectful attitude of the workers there), and explain to them that the first time one of these perverts even looked at my child in their store, they’d be getting the pants sued off of them. I wouldn’t sue, but they don’t need to know that!