terminated for doing math

I went to pick up a load that was just shy of 83,000 pounds. Truck included. The shipper weighs the loads with a yard dog attached and doesn't understand the weight difference. A manager ended up coming in so mad that she had to come in on a Saturday. She pointed at me in my truck and then pointed at the ground in front of her like a school teacher trying to control a delinquent child then started berating me about how I'm causing a problem. And when she asked why I thought I knew better, I said "math...." At this point, she started screaming at me about how I am calling her stupid and insulting her intelligence. And I literally just said math. If someone keeps making a stupid mistake and they feel self-conscious about it That's not my fault But apparently it is massively my company's problem Because this idiot has ended our contract. I'm told that they're standing behind me but honestly this is costing enough people their livelihood that I'm pretty sure I'm just gonna have to clean out the truck when I get back I'll find out when I get there. I don't know how to grovel. I don't have it in me anymore. I have a spine and it doesn't bend that way. Going forward I'm going to wear a body cam anytime I have interactions outside of the truck. They're not that expensive. I can get a decent one for anywhere from $30 to $65. Not only will it catch Karen acting like Karen, but I knowing that I'm wearing it will also make sure that I don't say anything or do anything that I wouldn't feel comfortable handing the footage over to my boss.