Just for fun, what is the most irritating thing your partner does? Just one thing, which isn't easy if they're like mine as I could fill the thread by myself. Thankfully the none irritating things are even more plentiful. And for balance, what would they say about you?
My DP still drives like he's just passed his driving test. He believes that test level driving is the pinacle of good driving rather than the minimum standard. And it drives me up the bloody wall so much that I'll only go in the car with him driving if I need to sleep so I can't see what he's doing. Other drivers think he's a learners without L plates on.
If you asked him he'd say my most irritating behaviour is opening windows when the heating's on. He thinks I'm happy for him to pay to heat the whole of northern Europe.