Careless, in my opinion, would have been running through the man when trying to spoil.
He actually did try to have his body go to the side as he made the spoiling motion, so he did actually make a decent decision in that regard. It’s just that his body positioning caused the spoiling arm to make connection with the head, hence why I call it clumsy.
If he runs through the man like a lot do, he likely collects the ball rather than the head, concedes a free kick and doesn’t get suspended as there’s no head contact.