To anyone who has an issue with this, I understand, as this is not the norm. However, some kids take it this far after habitual line-stepping, especially when puberty hits. The "He gave him passes" does not mean he didn't address his son, it just means he did not go nuclear at every incident. This is absolutely the point where he had to address his son as a soon-to-be man and let him know he can no longer go around bullying his own family, women included.
Some father to son beatdowns happen and sometimes it actually gets them to talk it out later in a different way. Almost like if you had a disagreement with a cat but otherwise liked him, assuming egos get put to the side, putting on some gloves and having it out can let you get all the angst out and have a real conversation. If impulse control was an issue, getting beat until you are too tired to do anything but talk can be the equalizer. And no the father isn't throwing bombs and knees, they just bout to fukk up that living room a bit. Whether or not this gets through to his son is not necessarily the point, but he will have to weigh his impulses to bully with the fact that he can now experience physical consequences.
For some, thats all they need to get right. I don't subscribe to whooping kids but you better believe if I had a son doing that shyt to my female family members I would be the first in line to knock his head off with love. Thats different from regular spankings, thats the definitive ass-whupping that lets us know whether this mothafukka should be part of this household going forward.