I gave him a little useful nugget of information about him being autistic two years ago. And I haven't heard a thank-you since then. Oh, except “thanks for the link”.
Not that I keep track of people's gratefulness. Because I thought about it just today. But here he said being grateful for an abstract community and also some dead famous person. So I guess he doesn't just have an awkward personality. And deliberately chose to be an ungrateful brat instead.
Oh and inviting to a concert is not a substitute for a thank-you. Conveniently, he has been “depressed” for years so I know what that means.