I asked him why he had this weird cleared area...
He never realised that you could move the mouse a bit, pick it up and put it down and keep moving it if you don't have enough space.
Apple did this really well (in the beginning)
Yes the user holding a piece of paper to the monitor to "scan" it
The user taking a photocopy of their laptop screen
"Users" aren't just the non-tech literate people in your family and workplace. It is also *you*
Someone who lives and breathes a product or solution will come to know that product instinctively, usually to the point that they don't even notice the quirks
Then when someone like me sees it, I don't have the advantage of having grown up with this from its infancy, I'm presented with the end product and there is an assumption that it is obvious what needs to happen
But when something needs a bit more knowledge to configure...
We were all noobs once, we are all still noobs at a lot of things.
So yes it's OK to laugh, but make sure you follow up with an explanation.