@JaneAir - I've discovered over the years that some people are just not technologically capable. It seems easy to you, but it just doesn't compute in their brain!
My boyfriend deals with a lot of these people all the time. He's an audiovisual technician, so cord adapters are pretty much second nature to him. However, he's always helping other employees at the hotel he works at. People always think they can hook up the AV equipment by themselves, but they just can't!