You're not going to like it, but the way you get over and past something like this is forgiveness. You have to forgive the pretentious twat who had the temerity to speak to you that way; you forgive him because that's how you eliminate his power over you. You forgive him because that's how you pull out the hooks. You forgive him because the alternative is, what? Carry this around in you forever? Find him and beat the shit out of him?
Just forgive him. Ultimately, he didn't have your gifts - the gift of grace, the gift of the expansive generosity of spirit that leads a person not to construe literally every social encounter as "which one of us is coming out on top? It better be me." The gift of not reflexively being a shithead to people, maybe. Whatever. You almost pity him. Almost.
Forgiveness is how you get past it. People don't like to hear it, but it is.
I mean, I was going through college when GW Bush was elected, and here's what I remember:
Everyone lying about GW Bush being the "first Spanish-speaking President" (he spoke no Spanish at all), the first of many lies meant to cover up his manifest incompetence and intellectual incapability
Republicans shutting the government down for weeks at a time
A maniac, entirely fictitious scandal invented solely to hamper Al Gore's election prospects (the White House phones scandal)
What was different about that day's Republican Party than today's? We knew less about it, was all.