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.