what is wrong with some people?!?! [rant]

background: im a 17 year old girl (i look way younger though) whos a cashier at a large grocery store.

SO im just doing my job, working next to a close friend of mine and its all fine and nice until this FUCKER who looks identical to donald trump starts interrogating me and LITERALLY YELLING at me because his order was 9$ instead of the 8 he calculated it shouldve been. I accidentally scanned a few pastas from the next order because there was no seperation and he starting flipping out and screaming and talking down to me, which is was hard to void the items while i try to listen to him and Im also overwhelmed that this man is screaming at me for ‘being a dumbass’ (quote, yes he SAID THAT). I only voided 2 of 3 boxes and he was like “HEY DO YOU KNOW WHAT 4 TIMES 50 CENTS IS?? DO YOU GO TO SCHOOL?” and all this other shit for about 2 or 3 minutes while Im trying to get ahold of a supervisor. conveniently my supervisor was outside in the garden centre sorting out an issue, so im standing there with this guy yelling at me with nobody to relieve me. now i dont really understand WHY PEOPLE FEEL THE NEED TO YELL AT CUSTOMER SERVICE EMPlOYEES BECAUSE I ONLY FUCKED UP IN THE FIRST PLACE BECAUSE YOU DISTRACTED ME WITH YOUR AGGRESSION. I LOOK 15, YOU MUST HAVE NO SOUL WHATSOEVER TO BE SO UGLY TO ME. This issue comes up sometimes where people dont put the dividers and im able to void perfectly fine with a little ‘thats not mine!! ‘ and its done!!! is it so hard to not be an asshole for one second?? okay this ISNT EVEN THE BEST PART. So my friend is trying to help me, and this guy says can she even help me??? DOES SHE SPEAK ENGLISH? (shes a visible minority but also BORN HERE IN CANADA AND IS SPEAKING ENGLISH TO ME AND COMMUNICATING PERFECTLY FINE). Then he tries to get his order free by making up his own thing called “scan code of conduct” and he tried to explain his homemade theory he tried to make me think existed about how if i scan something wrong your order is free. I was like nah dude that doesnt exist lol and he was like IM A SUCCESFULL LAWYER. YOUD THINK I WOULD KNOW. YOU SEE THIS WATCH? 1,200 DOLLAR WATCH. YOU THINK IM NOT SMART? (yet ur having a temper tantrum over your purchase being 9$ instead of 8 and buying all 50% items but thts none of my business) i was like ok and? (wasnt actually saying this i was being silent and not replying to him. pretty much the whole time he as talking to me i was talking to another cashier about the issue and completely disregarded everything he said so he was basically talking to a wall.) Hes like ‘this is a waste of my time. I CANT BELIEVE how uneducated you are. DO YOU KNOW HOW TO DO YOUR JOB?” and then trump starts to fight with the guy next in line who forgot to put the divider and was like “ARE U TRYING TO MAKE ME PAY FOR YOU GROCERIES? IS THAT WHAT YOU DO?” and the guy was a uni student just trynna live his life like why are you so fucking ugly!!!!!????!??!? and then when it was over i had an old lady come up to me and talked to me like ‘honey u are a saint” and another woman was like ‘idk how u kept it together’ and my cashier behind me was like ‘i wouldve cried’ so im happy i dealt with it right but wtf @ his racist comment at my other friend like shes literally solving ur issue rn. ok rant ov3r// time to study!!