I find this a fascinating phenomenon. Some of it is ignorance of the technology. Which I get because you can’t expect everyone to be experts (but if you don’t know the difference between a browser and your desktop just fuck off back to the bronze age).
The other is a true lack of empathy in the context of communication. Being able to communicate effectively with an equal onus on both parties to understand and adapt the dialog until the information has effectively been transferred is not hard, really, but some people just don’t care enough about the person on the other end of the line to be bothered.
That is infuriating when you’re trying to be helpful.