I could be wrong, though.
Oh, I think you are exactly right. She is insulting "certain types of users."
And that bit of elitism seems to be heavily present in the Linux community. Now I am not saying you personally display this attitude - no indeed. But during my attempts at gaining more familiarity with the various Linux offering I did encounter, on Linux forums, quite a bit of 'nose in the air' snideness with my inquiries. I am a computer user - not a builder or code writer.
Just my experiences. So I guess I recognize the 'tude displayed with that "Joe and Jane Sixpack" remark.
They're called 'Lusers'.