Besides the lead poisoning, i think that the material conditions boomers experienced are so unique that it can explain why they're like that. It was the absolute gravy train of history. They reaped all the benefits that labor movements fought for, they lived through a relative "peace" they didn't fight for, they got every concession that the ruling class was ever going ro hand out because they were afraid of the Soviet Union and revolution. They lived their whole lives in a kind of prosperity mankind has never known, and they took it completely for granted. In fact they took it as a given, that it was completely normal.
They have 0 ability to concieve of their lives in the context in which they occured. Which is what i find hard to understand, but its clearly true. This isn't a defense of boomers. I was raised by they so i hate them lol. But, ultimately was formed by material conditions, including a dash of lead poisoning.