So life being progressively worse under Biden is proof that Trump was bad. And things getting better under Trump is proof that Obama was good. But things getting worse for all 8 years of Obama was… forgotten, apparently.
This belief makes someone immune to facts. Once you get a whole group to adopt the logic inversion, they can reinforce one another to manage their cognitive dissonance with an identity built on feeling superior to those who disagree. Add some condescending propaganda to reassure them of their superiority, and voilà! You have a Kamala supporter!