Supervision doesn't have to be patronizing or demeaning. A 15 year-old isn't dumb anymore, merely ignorant and impulsive which does tend to make them shitheads but that's kind of a separate problem.

Most adults are shockingly bad at understanding and explaining their own thoughts and rationales, including to other adults. So when interacting with a teenager, they either throw their hands up or fall back on "shut up and do as I say" as one would with a 5 year-old.

That's where teens can be failed really badly by the adults around them because they are at an age where unlike children they are mostly/fully equipped to understand "adult" advice, and will not blindly follow orders anymore. But they also need way more advice, guidance and explanation than an actual adult. I think that's where the post is getting at. Don't forget that teens are kids, but don't treat them like they are subhuman or lacking in agency.