We've all had the unfortunate opportunity to be around a child whose parents don't have the word "no" in their vocabulary.
As someone who has worked at a popular cupcake chain, a luxury skincare store, and a bar, I've seen spoiled brats in both their child and adult forms. The best way to deal with a brat is to not engage with their ridiculous needs and not placate their temper tantrums, as they have their incompetent parents to give them whatever they're screaming about. If you're forced to indulge an entitled nightmare, it will luckily remind you of how lucky you are that your parents punished you sometimes. If I had been given everything I wanted as a child, I probably would be living on a pony farm somewhere right now and surviving on grilled cheese alone.