I hate being treated like a helpless, doddering old fool.

[Bernardo de La Paz]

1. Yeah, understand the feeling, but if the card worked perfectly for him then observe and learn

I understand you are angry at him, but he didn't get angry at you or call you names.

He did help you. Together you got the task accomplished that you were unable to do on your own (for whatever reason). Did you thank him for getting your card to work in his reader?

Anger doesn't make the card reader work better.

If he kinda sorta mistreated you (oh it's horrible) and you think it was because of his age, forgive him. He can't help his age any more than you can help your age.

If you really wanted to make an issue of it and teach him a lesson so that he doesn't abuse someone else so terribly by slowly and clearly helping them, ... then speak to him as clearly and slowly and condescendingly as he did while you explain that you felt abused and how awful that feels and how he can do better. Then thank him.