Here is the issue:
The OP's name is Rynn, but, for some unknown reason, her ILs don't acknowledge it and insist on calling her Katherine:
At some point, it looked like they had understood that Rynn was her actual name until MIL's birthday when MIL introduced her to her guests as Katherine:
OP was so annoyed by this Ils action but decided to make a joke of it instead of making a drama:
But still, OP's Ils found themselves so offended and even told her she had embarrassed them:
Actually, they had embarrassed themselves
"You could always just add "Kath" to the front of their names."
Inspiration is really limitless
And OP loved the idea:
Here's a new suggestion:
OP was thrilled with it:
This could also work:
This is how an introduction should go with normal people:
Turns out there are more people like her in-laws:
"They obviously play a game that is not funny for you"
Maybe this will help them remember her real name:
"Consistently, repeatedly getting someone's name wrong is disrespectful and rude."
But it's still a dumb move
"You are not wrong for having boundaries."
"NTA. Your name isn’t Katherine."
Redditors supported OP that she has every right to demand them to call her by her real name. Besides, what is wrong with her name?
Even if they don't like it, it's still her name, they should get used to it. And the quarrel they are trying to provoke is childish.