You're not reading very well, so let me help you.
In the context of MMA or boxing, there's nothing wrong with it, as I said above.
But that's not what we are talking about or what brought this conversation on.
Trying to fight a guy in the pits after the race is really stupid. One, because you aren't actually going to fight anybody. Two, because you put your crew members in the position to risk fines and suspension. Three, because that guy isn't going drive any different.
Trying to fight a guy in the bar (or anywhere) because he looked at you wrong, or your girl, or whatever reason you feel slighted, is also stupid. Hence two wrongs not making a right.
Fighting somebody back because they are physically trying to hurt you, isn't fighting. It's self defense.
And grown men have no business fighting each other for anything ever, outside the context of MMA or boxing. Other wise, it is noting more than a dick swinging competition that solves nothing.
So actually, you're welcome.