Why do people get mad at you for getting mad at them?

Have you guys had this happen to you? A friend will do something disrespectful and it will upset you, you let them know. Instead of them apologizing and working it out though, they turn around and make you feel guilty for being upset about what they did. It makes no sense! It makes me question my self. Is it not ok to get upset when people disrespect you?
Why do people get mad at you for getting mad at them?
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