Sokka is a genius but he did not know that Bato and his Dad were dating till their literally wedding day.
He thought they were just good bros. Best friends. Sharing a bed how you do. Y'know against the cold.
Sokka is both very observant and also completely unobservant, depending on what he finds important (ADHD king!)
I like to think he kind of assigns people a role/box and Bato has just been comfortably slotted into the "dad's Best Friend and Very Important Person" for years, to the extent Sokka just... doesn't notice when the how of 'Bato is important to Dad' changes













