No, it really is about specific ideas. I’ll discuss four:
1) Many on the left believe that non-whites are a cohesive political coalition with common cause and shared interests. This goes back to the 1990s with the “rainbow coalition.” A lot of the way the left talks to minorities, and various things like affinity groups arise out of this idea that non-whites will bring about left-liberal changes to society. Also the antagonistic way many on the left talk about whites. But most non-whites don’t think of themselves that way, as we saw in the election.
2) Because of (1), many in the left believe in permissive approaches to policing and immigration because of the disproportionate effects of those policies on black and Hispanic people. But the public wants more policing and less immigration, including black and Hispanic people.
3) Many on the left believe in treating people of different races different to remedy past race-based harms. But the public doesn’t like this—even California voted overwhelmingly against repealing the state ban on affirmative action.
4) Related to the above, there’s a general belief on the left that, in any given issue, policy should cater to the “most marginalized.” When confronted with the burdens to the average person, their reaction is to either (a) deny such costs and accuse the other part of various “isms” and “phobias,” or (b) assert that the average person must bear the cost.