First of all, what a very very rude person. I think your wife had every right to be angry, and I would too most likely. Still, I very much agree with your perspective, about not allowing these kinds of people to affect us negatively and give them space in our lives. I try to practice this whenever I come across people that act like this, and I think I've gotten better at letting it go instead of fuming. But not always though. Knowing things and actually acting on what you know are two different things. And everything takes practice I guess.