Corporal punishment has
decades of research pointing to it being bad, so feeling traumatized by your dad's actions isn't a sign of you being weak. It's expected. I had a friend who, when I was younger, talked about how whenever her mother would hit her she would go to her room and pray to God and ask him if he could tell her stop because it would her so much emotionally. She never hit her hard enough to cause bruising or to leave marks, but it clearly did hurt a lot psychologically. Abuse and maltreatment is very normalized amongst BIPOC households, so most people don't tend to notice or acknowledge their trauma. To add onto this, being dysfunctional as an adult is also, in some capacity, normalized. A good example of this is with drinking. Being a functional alcoholic is normalize in many parts of the world.
Along with that, people have different capacities for what they can psychologically handle, so something that might be traumatic for one person isn't necessarily going to be traumatic to another person. For example, I've witnessed my stepmother physically and verbally abuse my dad while trashing our apartment and I'm not traumatized. Meanwhile, I've seen people who have talked about being traumatized from witnessing their parents constantly getting in screaming matches. Everyone has a different threshold for what they can handle and there isn't anything wrong with that.