oh come on. Nobody is trying to hurt him. I seriously doubt he's sobbing into his cornflakes right now.
He's not a child. He's an adult. When I was in my mid 20s I was married, with 2 kids and a mortgage.
I knew enough to not walk up to strangers, make assumptions about them and patronise them. I would certainly not assume people knew nothing about something because they were parents or too old to understand modern technology. I would also not be arrogant enough to stand on a box and say hey, here I am, I am an expert, here to help you.
Anyone could reasonably be expected to know and understand that that sort of attitude is going to irritate.
There are a hundred ways he could have posted a thread that would have been genuinely helpful to some people. Or he could have taken time to read the boards and answer specific questions. There are a lot of threads to choose from. Reading them would have quickly told him that yes, there are indeed people who are clueless about tech but there are also people who are highly skilled who are already on the boards, happily answering questions. He chose to rock up and say I'm an actual man here to help you. I'm of the generation that really understands this stuff, unlike you.
If he was unable to see before how the way you present yourself makes all the difference to the way you are received, then he has learned something that hopefully he can use in the future.