Why is ok for a father to hit his son but wrong if the son hits back?

I had a heated argument with my father. There were awful exchanged and he ended up backhanding me. Then mom gets involved and pulls me back from hitting him back, begging me to don't do it. I was ready to hit him back for the first time. I didn't want to hurt mom in the process so stopped. I wanted to hit him back so badly. Damn. It sucks I couldn't return the favor. Why is it a taboo subject from an adult son to hit back his father?

Well I have reservations for my mom and other women. At most I'll just push them out of the way, then leave. But with my father or other equal matched men, it's on.

Updates
11 mo
I'm upset that mom didn't let me return the favor.
Why is ok for a father to hit his son but wrong if the son hits back?
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