Hey, Peter's live-in remodeler here.
The dad and shopkeeper were both trolling them. Striped paint isn't a thing you can buy in any form, horizontal or vertical.
The dad may have sent him out so he could have a friend over, but I think he got mad when he realized he had been had.
But hey, I gotta go. I have an appointment to top off the blinker fluid in my van.
On the other hand, Tartan paint exists ...