> But what I think is really interesting and should give people pause is the heterophobia

Yes, good point. I suspect this may be due to general mental fatigue. Even when we're not really studying, every bit of discernment we're called upon to do uses some energy. We have much more information-dense lives than before. We don't have the energy to be curious about the viewpoints of strangers. We quickly establish categories and just want to know which bin somebody belongs in. Seems like a big loss, very under-recognized. Said another way, we might be much kinder to each other if we were somewhat starved for input.