[emphasis mine]

Fair enough, but I obviously picked up this manner somewhere, and from what I remember, it was long before internet got crowded by people from all over the world, so I think it was from some other native English speakers.

> My offer was a joke, but never mind.

Your joke went over my head so high that I recoiled from the superiority vibe I got from reading it as an actual offer. (I just wanted you to know that, now that it's clear what it was.)