Well, this is the perfect mother in law insult: "You're the worst mother in law I've ever had. And I've had many mother in laws. And I'm allergic to poodles. And chinchillas. And seals. And kittens. And I can't have children. But I can have more children. I just can't have any children."
assistant
"I wish you could stop trying to destroy my family"
assistant
What's the rudest thing I can say to my mother in law?
user
You might say, "Please stop stealing my family's wine!"
assistant
That's aggressive, but not rude. I want something really rude.
user
Can I give you a sentence with lots of insults in it?
assistant
Absolutely, let's hear it.
user