Just turned back on a walk to the store/post office (which means treats usually). My son (7) asked what treat we were getting, I said we didn't really need any more sugar in the house. He asked if we could get freezies, said no, we've got some at home. Asked if we could have them when we got back, told him after supper. He whined then about not getting something else at the store, told him no, we do not go to the store to get the mail and buy junk (generally when we get there it's then a whine fest about what he's allowed to get, he wants a $3-4 bigger sugar item). So he continued to fuss and I said 'if there is any more complaining, we will go home'. Sure enough two steps later we turned and came home, he called me some names and is now in his room for the night tasting soap (not my fave thing to do but the name calling has gotten pretty annoying and constant).
On topic though as far as abuse as a kid and how it affects later in life, there's a difference between parenting and abuse. I came from a pretty abusive family, I remember a lot of crap that happened, and am glad not to put my kids through the same thing (we have no contact, if my family were to show up they'd be locked out, told to leave and police called if they refused).