I think my initial shock was that he's my supervisor and couldn't even identify that it was a standard outside of the Galaxy S5, so it brings any IT knowledge of his into question.
That being said, he was pretty open about us technicians knowing more about the nitty gritty computing than he did, so his lack of IT knowledge wasn't a major issue as he was a decent team leader, which I found more important to his position.
I'm completely with you and I daily drive Linux. It's not just Lemmy, there is a vocal majority I've anecdotally seen that have this thing to push Linux onto everyone.
I used to be the same, until a friend I was pestering outright told me that it was ruining our friendship and Linux does not fit his needs, and it's not something he's open to.
Ever since, I've taken the approach of just never bringing it up and while I'll happily answer questions, I accept people still need Windows and aren't ready for such a sudden switch, because contrary to what that vocal majority says, it is a completely different environment for normies and takes a lot of mental energy and adjustment to get used to an entirely different system, even if the interface is near identical.
Side note: having this vocal majority seems to be a thing I've also seen in other vegans, surely there's a term coined for this phenomenon because it's certainly not limited to Linux users.