I just got called dumb

I work as a cashier part time, and a customer came to my cash and was being loud on his phone for one. I was checking out the woman infront of him and she’s old so she’s taking her time putting stuff down on the maneuver, and he goes can u click the button to bring it up. I told him she needs space to put her things if I press the button all her things will go to the front and she won’t have room for the rest of the stuff she hasn’t put down yet and he goes yeah but I need to put my stuff down.

I was like whatever, so I did it and the woman had to stack things.

Then it’s his turn. He grabs a cheese and goes can you tell me the price because over where I got it, it says it’s 4.99. But this is the kind of cheese where the price is labelled already on it with the pounds and all that. I told him the price that’s on the cheese is its price. He goes but over there it says something different and then we started talking about how much it is per kilo, and I read the thing wrong and said 179/kg and he goes are you dumb so you know how much that is? And he continues saying I don’t mean to be disrespectful and I say then don’t be, and he goes I understand you must have not done well in school and have to work here but.

And mind you, I’m in university and work this job part time 😭

I called my manager over him and told him to replace me or else I’ll blast this dude.