FQ, the good part is neither your Mom nor you were seriously injured. Pride does count, but not as much as physical injury. As you know, here in Florida we have no duty to retreat, and the "castle doctrine" extends to your vehicle. So, you might have had some 'splainin' to do, but you probably would not face a judge if you shot the b@st@rd--that is, if you didn't smell of Sam Adams when you pulled the trigger. The smell of alcohol would, I think, change the results. So, in this case, you were probably lucky.
However, if you would have drawn your weapon the instant he got out of his car (with a 'roid rage crazed look) I feel rather confident that he would have immediately got back in his vehicle and driven off. If he didn't, at that point you would know you had a real nutcase on your hands and two to center mass and one to the head would have been an appropriate.
I guess what I am saying here is that although it is against Florida law to carry at a bar, it's important to remember the "concealed" nature of carrying. You could have left the piece in the car while you were inside, and re-armed yourself when you got back into the vehicle if you want to respect the letter of the law. But, you should always have your piece with you. Even in church.
Always carry. Always be aware of your surroundings, FQ, and when anything looks a little odd, be prepared to draw. And give your Mom a kiss and some flowers and tell her she did just the right thing.