Well yes, case in point, social media has a tribalizing effect on people. I don't disagree that comments on the internet tend to be polarizing. I wouldn't have commented at all if it wasn't to disagree with somebody, that's normal in these parts.

I wonder what happens when most of the population is relying on such a medium for their understanding of the world beyond what they can see and touch? I don't think me setting a good example here on HN is going to have much effect against the basic human impulses that social media selects for.