Grabbing your childs arm roughly and yelling at them when about to touch something hot is fine and expected.
Is it really? Honestly I’d rather a child touch something hot and learn the lesson that it is unsafe than potentially learn the lesson the people charged with taking care of them are unsafe. I mean, I remember burning a finger on the stove when I was little. It sucked but I was and am fine. I was lightly verbally abused by my Dad exactly once (he apologized after), and it was much, much worse. I was verbally abused by teachers and peers, and it was much, much worse.
[edit: I retract the sentence “Honestly I’d rather a child touch something hot and learn the lesson that it is unsafe than potentially learn the lesson the people charged with taking care of them are unsafe.” It was poorly thought through and poorly worded. To be clear, I do not condone intentionally allowing a child to touch a stove to teach them it is dangerous. I also do not think that the threat of a child touching a stove justifies physically and verbally abusing a child, as OP said.]