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.
Taking the general lesson to the specific application can take training. Not everyone will understand taxes just by reading. Look at how many adults now a days don't understand tax brackets as a good example. Tax brackets are something that is fairly simple to explain and yet we have a good portion of adults who don't understand them and will insist they get less money while getting a raise.
My first sentence isn't bogus, you just happened to understand the general lessons and apply them to the specific application. Other people find that challenging.
Most don't understand it because most are stupid. About 50% can't read at a 6th grade level and about 19% are functionally illiterate. Taxes are hard because people can't read.