That's arguably consequence of the discussion being over the phone, not of it being about computers.
In my experience, any kind of task which involves giving people instructions is extremely frustrating when done over the phone; there's just too much context missing, so you have to start being extra precise to compensate - but then, most regular people aren't used to being talked to with precision, so they start getting annoyed and push back.
The most common example I can think of is trying to explain someone over the phone how to get somewhere, when you know the lay of the land but they don't. A lot of frustration and useless info gets exchanged before they're even able to communicate you where they are.
"can you read what is on the screen right now"
"There is nothing on the screen!"
"there is a box on the center of your screen with words, please read them"
"OH that box.."