EDIT: A lot of you are reading into the tweet while still somehow agreeing with the overall message. No one is saying we should eliminate music programs or that we should teach toddlers about healthcare plans. The tweet is making this thing called a --checks notes-- joke, that also conveys the message that schools could teach more practical skills that young adults will need going forward.
Schools teach mathematics, reading comprehension, and how to follow instructions. With those 3 skills people can do their taxes. We used to do it with a paper form and a paper book full of instructions. Now there are programs that do pretty much everything for you, all you need to do is answer questions. If you can't figure out how to do taxes then you have a bigger problem than the schools not directly teaching you how. As far as understanding all of the intricacies of US tax law, that is a much larger, more complex issue than they would or could reach in general education. There are entire university programs for that education.