I can’t think of a reason to mock. Pointing it out could be a poor way of communicating a point. From your post, it seems like it was a bad experience overall. We had a coach that was bringing some other issues (external issues) to the field and exploding on the kids occasionally. It’s why he became a former coach.
Coaches are human and will make errors in communicating. I’d say if it’s his norm rather than a rare exception, it’s worthwhile discussing it with others in the trust tree and then speaking to the principal/dean/AD or whoever is above the coach so that it gets addressed.