I think your comment about the generation gap is really valid Meeyoo . Sometimes my DD and I will chat about things from when I was young, and she feels like it sounds hundreds of years ago, she can't get her head around how different it all was, but she enjoys hearing about it. Wheras with our ES - I think he literally wouldn't believe a lot of it, it's so strange to him, or he simply can't relate to any of it, but the bottom line with ES is he's simply not interested - he feels the focus of everything should always be about him, or it proves we are self-centred and don't care about him. Where are daughter is interested in understanding me and Dh, as she sees us as people and feels it brings us closer still, our ES was only interested in us as his parents, and because he can only focus on that he can't see us as people so can only see our failings, well mine in particular. And he could definitely only see us through the filter of 'today' and how the world works now and in his world, so any opinions or habits we might have that don't fit in with current thinking are clearly more failures.
For example, my generation and social circle, were a lot less vocal about expressing our emotions. We would try to do right by people and show we cared but didn't express a lot of stuff. To our ES that means we didn't care. He seems to have forgotten about anything we did for him, and can only focus on the things we might not have said, or not said in the way he thinks we should have. But again, I'm half guessing from snippets from our DD as he won't actually discuss anything.
But I do think the generation gap and different expectations is part of it.