As for the collector, his art may not be to your taste, but it obviously makes him happy. He’s proud of it and wanted to show it off; the museums made him feel validated. Boasting can be annoying to the listener, but I think a lot of us do it. Art is so subjective, and the things that you like may leave him feeling equally cold. Look at it this way: at least you don’t have to live with it. :0)