I don't see any popular evidence that Boomers were different in inherent personality, rather there were enormous social changes afoot brought about by inevitable historical shifts, which puts them in a different context.
Younger people also don't have little living memory of those before them for a basis of comparison.
My Great Grandparents were disowned from their respective families because one was French Catholic the other English Protestant. That wold have been 'normal' for the time. That's not even the tip of the iceberg for 'estranged family'.
My German ancestors would not attend my Irish ancestors wedding reception (they did the ceremony, but not afterwards), because they felt the Irish were brooding alcoholics. Which would itself be a bit of racism, but it was essentially true, I mean, the stories I've been told ...
Some of the casual Boomer bigotry I see on other Social Media and TikTok especially is fairly shocking, it's as though people have no insight into what happened in the last century, especially the later part of it.
Maybe it's possible that lead poisoning had something to do with it, but I wonder if it would have changed things that much.
We no longer have any living memory of the holocaust, the introduction of mass media / TV, life before vaccines, serious adversity, life before plastics (!), birth control, antibiotics, vast infant mortality, real war (Vietnam being the last), or overt and institutional racism (i.e. the bank policy says 'no loans to blacks'), or direct segregation (this fountain is for whites only) or when almost everyone 'went to church' as a cultural event, not so much for overt religiosity, but wherein it was an more or less just a community activity that 'people did'.
In terms of material possessions, safety, opportunity, legal recourse, and focus on self ennoblement and aspiration, we live in an age like no other. We are collectively like the children of a 'Very Wealthy Family' - some a little better off than others.
Hating on an older generation is a perennial pastime, it's the lack of context that's a bit disturbing.
Finally, I believe that every individual story of social malaise is 'very complicated' where there are generally few true heroes and few true villains.