What makes me angry

It takes a lot for me to get angry. I typically never show anger. When I do get upset it would have to be when people are rude for no good reason. You could be very polite to them and they either answer with a bad mood or attitude. This would happen pretty often at my previous job. I was a cashier at a restaurant and sometimes customers would be super rude to me. I was always told I was the nicest cashier, but when I would get customers like that it would get me very upset. Although I was never rude back I would get mad at the fact that I did my job right and they think it’s okay to be mean or rude to the employees. There was one customer in particular that was so rude and plain difficult while I was taking their order and then they have the audacity to purposely spill their drink all over the counter and told me rudely go fetch me another one and with another cup. Honestly that was the only time I truly felt really angry to the point where my face felt hot and I stood there in disbelief. Then the customer decided to change their order last minute which wasn’t cool at all because their dish was already made. This customer was the one to make me burst and become so angry. Another reason I get angry would be when people aren’t honest with me. Lying would be one of the ways to get me upset. I’ve never been a person to judge and tend to be very understanding so I don’t understand why people lie to me. I always speak the truth whether it’s good or bad and I respect when people do the same.