Seeing things as a difference of brain power is freeing. I had never really considered that option for most of my life. Instead, I had just assumed that "human intelligence" put everyone at roughly the same place. It made differences of opinion very difficult for me to grapple with. I would go over something with a friend, they wouldn't get it, and I'd keep at it again & again under the assumption that eventually, they would catch on. Ugh.
Sometimes people are just broken from their own personal history, or they're indoctrinated into a way of thinking and cannot see it. It is very useful to recognize such issues and route around the damage.
The first time I realized that I could write off the opinion of a someone who had consistently voted in ways that had terrible, terrible results, it was incredibly liberating. Why am I taking advice from someone so reliably wrong? Why are they lecturing me? I broadened it out to politics in general. Why am I listening to the group that screwed things up? Don't I have any discernment? Can't I evaluate someone's position and decide it's foolish? And if they advocate such foolish positions regularly, can't I write off the person as a fool?