They were serving a hot drink. Have you never ordered a cup of tea in the UK? Should I be able to bankrupt any cafe owners if I spill a cup of tea down myself?
She got a takeaway drink then put it between her legs in the car park, removed the lid and split it on herself.
Yes a hot drink is hot, adults should be aware of this.
I make these “extremely dangerous”, as you call them, hot drinks every day at home, in fact the ones I make are even more dangerous as they’re hotter (with water straight from the kettle) and the mugs I use at home don’t even have a lid.... strangely enough I don’t tend to stick them between my legs as that would be a silly thing to do.