Man, I have no patience for rude customers. I'm normally very polite and helpful. If the customer is nice, I'm nice right back. if they're rude, I try to stay professional and ignore it. If they're specifically rude to me (as opposed to a subtle air of rudeness), I initially stay professional but call them out on it. If they continue or are extremely rude, I kick them out of the shop. No second chances. If they get really bad, they can expect to be told off, harshly.
In two particularly bad cases, I've threatened customers with violence. One dude I met outside the shop and then challenged to a fight. He wasn't prepared for that, and didn't take me up on my offer. I still fantasize about hurting him.
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