I mean, I've been a cashier for ten years and have worked with clothes for as long, and you just don't do that. You don't have to be an expert at folding but for God sake don't treat your customer's new clothes like trash. And focus on your customer. Don't ignore them, and especially don't talk to your colleagues instead.
I said we ought to go back and complain to a manager, but my mum didn't feel like she had the energy.