[ido]

YES ^

Absolutely teach your kid (if they are actually interested) to code. It doesn't matter that they'll write horrible, barely functional code. That's how we all start.

They don't have to learn "proper" long-term coding etiquette - if they choose to do it professionally they would have plenty of time & opportunities to learn that.

Just get them started anywhere so that that kindling of interest can grow and they can make their mistakes and learn from them in a safe environment.