As though significantly more consequential things aren't happening in the world.
I don't know... on the surface, your comment seems "right" in some way, because we are just talking about two celebrity-types and something that escalated when it was of very little significance, really. The joke was insignificant, and the resulting slap was only slightly less insignificant.
However, I feel like the issue surrounding this incident is actually a very important matter that I think the world should have more discussions about. And that is: "Is it acceptable for someone to take physical action against someone who has only said words to that other?" On the surface, one would obviously side with any grade-school level teacher and say that "no - it is not okay." However, there are still plenty of people who would pursue physical action if someone made fun of them, or used unsavory words about someone they cared about. Again... just words.
And this hearkens back even to The Bible, where we can see that the attitude of ancient people's certainly was that it was okay for things to escalate to physicality given an insult against one's self: Kings 2:24. Wherein someone could even claim to have "God's blessing" in raising a confrontation to a physical level when all that has been exchanged are words.
Since I found out about this this morning, I've actually been encouraged to find that the majority of feedback sides with the grade school teacher! "No" it isn't cool to physically assault someone who is doing nothing but hurling words your way.
Regardless, this is an issue that ranges far beyond "Chris Rock" and "Will Smith". They just happen to be the vehicle to bring it into the light, and onto the table for discussion. And I hope that the fallout leaves many of those who think it is okay to go about punching someone who is making fun of you to have second thoughts, and to take a look at the matter, and perform a bit of introspection more thoroughly.