Why do people get so mad when you card them?

I had a few tables the other night that I had to card when they asked me for a beer. When I got their ID's the date on them was 1987. That would make them 21-22 years of age. One guy actually said to me "Are you serious, you need to see my ID?" His ID made him 22. I have to card you if you look younger than 50 by law. Why do people get mad? Especially younger people?
 
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