Nope. He did not have the capability, opportunity or intent to do serious bodily harm. YOU would be going to jail for a lot longer than this douchebag.
However.....if he walked up and said, "You support Trump? You're dead m***********r.....and started pounding the kid (who is a lot smaller)...you could use the "disparity of force" equation to probably do so.....but you have to prove to a jury that that kid probably would have been killed or seriously injured if you Didn't pull out your CCW and use it.
Here's a scenario: you're driving with your family in an unfamiliar, seedy part of the city ( remember National Lampoon's Vacation?")
A thug runs up to your open driver side window, grabs you and starts yelling obscenities and other threats;you see no weapon.
Are you justified in pulling your weapon and firing?
As a concealed carry permit holder, I've wondered about this and really don't have the answer.