Why are customers fucking rude to associates, like what’s the point of putting them down when the worker is trying their best to help you?

I had a customer today who asked the premium employee(phone representative) for help on the laptops, and the premium guy told me so I could help the customer, and the customer said, “Aw man I wanted you to help me, you look smarter than him.” while pointing at me.

He then got mad at me because he asked me, “what can you tell me about this laptop?” And I replied, “What do you want to know?” He asked which one is better between two of them, so I started looking at the specs and the guy said, “Jesus Christ bro.” Like dude, you’re not really letting me help because you’re not being specific on what you fucking want.