What's the most petty/pointless/pedantic hill you're willing to die on?
For me, it may be that the toilet paper roll needs to have the open end away from the wall. I don't want to reach under the roll to take a piece! That's ludicrous!
That or my recent addiction to correcting people when they use "less" when they should use "fewer"
I adore David Mitchell and his rants. I really liked the one about how "rape" should not become socially acceptable and silly when followed by "pillage" just because the Vikings are depicted as having worn silly hats.
"I could care less" is almost always said sarcastically. A hallmark of sarcasm is saying the opposite of what you mean. So, a sarcastic "I could care less" implies they could not care less.