Or just linux?
I think the latter. And it might surprise you, but there are computers with no linux installed. I think the vast majority actually. So why the need for insults?
Guess what, I also only learned recently (some years now I think) after making it mire default, that on linux the windows key is called super key. And the person you insulted clarified he did not use linux at all.
So, how should he have known, despite working with computer extensivly?
I used some sort of *nix on a VAX terminal in college and ran SUSE on my machine once I realized I hated Windows 98 but all of that is ancient history at this point lol. All of that is to say that it is possible for someone to be peripherally interested in this topic and not be aware of what a super key would be even in context. Maybe someone that uses Windows could pick up on it earlier but I certainly didn’t:)
Most people that look down at their keyboard will be able to visually identify that icon out of the bunch, methinks.