Why do people who say on offensive joke get offended when someone objects to their offensive joke?

it usually goes like this; someone will usually make an off-color comment or joke and if someone gets offended at the joke, then they person who said the joke gets offended that the other person got offended and starts complaining that their free speech is being stifled and how no one can say anything anymore instead of apologizing to the person they offended.

Why do people who say on offensive joke get offended when someone objects to their offensive joke?
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