He deserved it and so do you.
That depends very much on what he meant by "whipped his ass" which is, as I'm sure you know, a euphemism not usually meant literally.
As for me? I don't have kids. I have also never raised a hand to another person in my life. I'm almost constitutionally incapable of doing so.
I was spanked precisely one time (for nearly running out in front of a car at age 4) growing up.
I don't anticipate using any sort of corporal punishment when I do have kids, at all.
But I have come to believe that my former mentality (which you still have, seemingly) that any parent who ever utilizes that method is some sort of horrible, evil person... was extremely naive of me.
I think some people are just too fucking thick to be raised in the way I was. I had no curfew, no rules imposed on me at all... I watched whatever I wished, played whatever games I wanted... stayed out til all hours and would disappear for days... and was a total goodie two shoes for the most part. I caused my parents no problems at all. Some people can be given that sort of unrestricted situation and be fine in it.
Others cannot...
It's a lot like religion I think. I am an atheist and always have been, for the longest time I assumed everyone should be. Now I've come to think that some people really do need religion, in the same way some people may need to be smacked.