Why do some people get offended when you don't laugh at their joke and get offended because you got offended?

For example, someone makes an offensive remark and tries to pass it off as a joke but then they get mad at the person who found their joke offensive. Why do people who say something offensive or bigoted get upset at the person who is offended instead of owning up to their mistake and apologize to the offended person.

Why do some people get offended when you don't laugh at their joke and get offended because you got offended?
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