When my boy was in fourth grade we had 'the discussion' - you know the one - "why Windows is evil and hastening mankind's demise".
So, he became cognoscent of OS choices and the like fairly early on.
He started telling me about his ID10T 'technology' teacher shortly thereafter.
This woman had a computer lab for the students which was composed entirely of Mac's.
So, what does she do? She paid someone to come in and wipe OSX and install Windows for Mac on all of them because "it is more secure."
When my son downloaded Firfox she made him uninstall it because "Internet Explorer 7 is the only secure browser."
When he started middle school I thought maybe his tech teacher would be a little bit better informed. No such luck, he got in a knock-down drag-out, the first week over - get this - "visiting Slashdot"!
So when I sent this guy excerpts from the NSA's findings on Windows security flaws he ignored he suggested it was made up.
When the huge security hole in IE made news a few weeks ago, I told my son to show the story to his teacher.
His teacher says to my son,"That's great Brad, I'm glad you made up a website that says Windows isn't safe..."
I simply give up...