You're feeling a little put out, so you want to get a little snippy in an email--just to show 'em. Put him in his place, so to speak.
Don't do it. I repeat. Don't do it!!!! You will spend the night worrying and wondering how you were going to approach the correspondent. You will lose precious hours of sleep and wake with large bags under your eyes. You will have to apologize. This means admitting you were wrong. This is difficult, especially when you are never wrong, so don't have much practice in the area.
So don't do it! Just be kind. Always.
That's all I have to say on the subject.