My local hardware store has one of these signs. I managed a different hardware store about a decade and a half ago, and I also made a very similar one. (Mine was nicer, and routered out of a scrap piece of plywood.)
You would be amazed at the number of times we'd get asked that question. Typically it involved a story along the lines of, "Well, my wife started putting up her end of the Christmas lights at one side of the house, and I started putting up my end at the other side of the house, and we met in the middle, and..."
I don't understand how people need help making a cable like that. AFAIK It's a length of 3 wires wrapped in insulation, and two plugs. It's a hell of a lot simpler than ethernet.
Some older things might genuinely need that kind of cable, like a leaf blower or something
They absolutely do not. The simple point that if you plug one end in, the other will have exposed live wires in the prongs proves that that is never done. Power connectors are gendered for a reason and the reason is electrical safety. Female for output, male for input. Always. Everywhere.