Why does being rude cause me to experience anxiety symptoms?

I noticed anytime I say something mean I get anxiety symptoms like I’m afraid of the person’s response. Truthfully I’m not afraid, but my body is signaling to my brain that I’m afraid. I’ve seen others say very cruel stuff without flinching. I don’t get it. I’m not looking to be a mean person, but I’m just curious why this is the case.
Why does being rude cause me to experience anxiety symptoms?
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