It is true that everyone parents their children differently, and I definitely got two separate parenting styles growing up from my mother and father. My mom treated me how her parents treated her as a child and same with my dad and his parents. Looking back, I see that how they were raised really affected their parenting styles. My mom focused on reinforcement while my dad focused more on punishment. A lot of studies show that most punishments are not effective and can actually drive a child away from the parent.
Physical punishments and things such as yelling and screaming were punishments shown to not be effective. These can affect a child in the long-term as well as their future parenting styles. I believe there are certain ways to punish a child when they are exhibiting bad behavior, like time-outs. As we become more informed on the best ways to parent, physical punishments become more frowned upon. It is definitely something that is more "old-school" and was more frequent in older generations. Older generations can carry that parenting style to today's generation causing a lot more harm than good.