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"
The seventh planet from the sun should be called Caelus not Uranus. All the other planets get named after the Roman equivalent of their respective god, why should that one get special treatment just so people can make puerile jokes.