Agreed; I read everything I could get my hands on as a kid, and was a prolific writer of random unicorn and dragon themed stories, but I absolutely hated English classes at every level of school. And
this is a pretty good piece on why math classes in school are awful.
The example in that Reddit post was probably better because it wasn't a regular class being taught by a regular school teacher; it was just some guy in for the day to introduce the kids to programming concepts.