Very interesting Article on political prejudice that I stumbled across. It was published over2 years ago but still seems to be spot on. It's long but worth the read.
https://www.theatlantic.com/politics...judice/583072/
".....In general, the most politically intolerant Americans, according to the analysis, tend to be whiter, more highly educated, older, more urban, and more partisan themselves. This finding aligns in some ways with previous research by the University of Pennsylvania professor Diana Mutz, who has found that white, highly educated people are relatively isolated from political diversity........
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Partisan prejudice is different from other forms of prejudice. It is not yet embedded in all of our institutions, the way racism has been. But the evidence shows that it distorts our thinking, just like other kinds of prejudice. ......
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partisan prejudice now includes a bunch of other prejudices, all wrapped up into one tangled mess. “Americans are really divided, but not in terms of policy; they’re divided in terms of identity,” Mason says. “And the more identities come into play, the more salient they are, the harder it will be to agree, even if policy positions shift.......”