I work cash register at a [redacted] I've worked here for 3(1/2) months, from new management I've gone from an above average employee to the best non manager worker I've never had a bad experience with a customer I always keep my self level headed, and try to be as nice as possible, and help the new managers deal with rude, or customers who want to resolve their orders I've had only 2 refunds in my time here, and I do all the work i can. 
Today I was put on drive thru with no assistance, and the only food handler for the night didn't come in,i had worked from 4 to 7 getting out big orders till a customer ordered a sandwich with the sauce on the side fresh fries 2 orders, and a large amount of chicken with extra sides I got everything through fresh, and I know the fries where fresh since I dropped them the moment he was up at the window I got everything bagged up except I put sauce on the sandwich, and the customer pulled the fries out over them being cold tossing them on the window sill, and yelling about the sandwich I let him keep the first I made since it's trash at that point, and I'm trying to explain the wait since it was only 2 employees running things with no chicken at all for the afternoon so he starts asking for the old management, and I try to say all of them are gone he gets frustrated, and he ask for a refund I just get him out of there since he's backing up the line, so I give him his money, and then he ask for my name I had already repeated it 3 times throughout his entire ordering process, and was getting bothered with him so I just refused to waste my time the whole time I kept my voice calm as how I'm sevely sick so my vocals hurt when I speak loudly the guy said you should look for a new job cause you're an asshole.

Ironic he didn't mention him calling me, an asshole, cursing, and raising his voice over an order I could've fixed in the report he called in.
 Also he claims his wife comes in constantly for 30 dollar orders I only get one day off looks like he wanted chicken a day earlier since I've never seen him before.