I get jokes analytically, but I don't "get" jokes. The only type of humor I understand is Irony.
I know for a fact that as a young child, I could NOT be jokingly teased, I would flip out. Even if it was from loving family members, and meant joshingly. I was always mortified by the pointing out of my flaws, however minor, however unintended, however kindly put. (I still rage, I just hide it better nowadays.

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JenFD wrote: The thing is is that, they think it's OKAY to joke with YOU in a cruel manner. Which ticks me off.
That's because they assume you understand their POV. Like you can read their mind. (Lack of ego-boundaries.) Which is why they're genuinely shocked when you get upset in return.