Her comments about 30 minutes into this are on the money. She points out that US politics has become divided into competing coalitions of “tribes” who think they are oppressed and under attack, but who regard “the other side’s” claims of being oppressed as ridiculous. She also points out that the “intra-white” political conflict is just as divisive as the conflict between whites and minorities, that class is as divisive as race and culture, and that affluent, urban liberals and leftists have formed an ironic “cosmopolitan tribe” (which transcends political party boundaries) that is very exclusionary toward outsiders.