I think a swat or two over clothing is acceptable, and necessary in dangerous situations, but anything above that which involves planning, preparation, bare skin, implements etc is abuse in my book.
It never happened to me, although my mother had this way of grabbing your arm, pushing your sleeve up, and slapping you hard on the forearm ten or twelve times in rapid succession. To this day I still remember how much that hurt.
Mostly, when they wanted to punish me for something or other, they kept me away from my books.