This is like having someone tell you that they refuse to use an iPad because the home button confuses them. That's your choice.
I've used GNOME professionally for 7 years now, and I've taught kids to use it at robotics workshops. If you can believe it, many of them are unable to use macOS and Windows at all, because their school districts don't buy them laptops anymore. I'm sorry that GNOME isn't a carbon copy of your favorite OS, but it's not hard to use whatsoever.
Clearly you're not a golfer.
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?
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.
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?