I don’t like it at all, but I guess for me it is abusive when it is inflicting lasting pain, or intense pain at the time it happens. I think any corporal punishment outside of an open hand is over the line. I think if it is done excessively, I read one study that many parents said they used corporal punishment on average 3 times a week (it was an old study from years ago, so I assume the numbers are different now) which I find outrageous and excessive. But, I also remember the cousin of an exboyfriend of mine hit her daughters hand probably 5 times a day every day so she would stop reachng for things.