That's not the only context. I would likely appreciate git at 12yo. I definitely enjoyed programming already and I believe that was the time I learned more about maths to code some music visualiser plugins and was sending fun examples back and forth with a friend. Git would've been useful.

Then a lot of people don't need to learn maths beyond addition and multiplication.

I prefer the opposite interpretation though: anything can become a hobby or puzzle. That puts nearly everything on the "ok" side of your line.

Would you have the same objection if the guy were teaching his kid how to use a screwdriver?

You don’t use git when you’re working on hobby programming projects?

Isn't wanting to teach your kids the family trade a rather ancient tradition?

Is there any particular reason behind saying that that's bad?