The world is a big place and while Linux is very visible to many of us it is irrelevant to the mindshare of the vast majority of the world. Not because of ignorance, but because it legitimately isn't that important to their life.

I don't care about the hem on my pants. My pants either work, or I get a new pair. This is most people's relationship with their computer.

> My grandmother would often identify stitching on my slacks. I was, quite literally, blind to it!

I'm telling myself that this is an intentional "blind hem" joke.