In what universe? Certainly not the one where all polling data had Trump beating him in a landslide, where Biden was so unpopular that he was going to lose the Dems down-ballot races. Biden seriously thinks that the issue with Kamala Harris is that she was a black woman, instead of realizing the issue is that Kamala said she was going to be 4 more years of Joe Biden politics.
I actually hate the idea of using boomer as an insult to people who are just of the right age. To me, you gotta have a certain state of mind and actions to count as a shitty boomer. Just as there's some super cool old hippies out there, there's entitled 30-something Karens out there that need to hear "Ok Boomer."
Age warfare is a distraction from class warfare, of course. Not to say we can't find patterns, but we gotta keep in mind that stereotyping is kinda meh.