That’s what this sounds like to me, too. Don’t take it to heart, and don’t engage with it. This is the way the year are sometimes when they don’t get what they want. No different than a two year old having a tantrum - except they now have more sophisticated ways to hurt us.
I would take him at his word and stay out of his life for now - until he can come back civil. After all, he asked you too. At 28, he can figure out how to get his car registered and insured, or suffer the consequences of not doing so. I think the only way they learn to be grateful for what we do offer to help is when we let them muddle through on their own. Hopefully, with time and maturity he’ll be able to come back to you with a more honest assessment of your relationship. I’m sorry he’s putting you through this right now.
