To those people, Republican = racist. The two words are equivalent and interchangeable.
If an SS solider who murdered thousands of Jews wanted you to be tolerant of the diversity of his position, would you? Republicans are equivalent to the SS soldier. I mean that literally. These are people who believe that speech is actual violence. Meaning that if you say, for example, "there's a biological difference between a woman and a transwoman" that is not just an opinion, it is literally inflicting physical harm and death upon transwomen. That's a major part of why they openly oppose freedom of speech(along with the oppressor-oppressee and white supremacy power dynamics that are at the core of everything critical theory).
You're trying to understand them through an assumed set of core "American" values like race/sex/orientation/etc-blind equality and freedom of speech and individual liberty, but they have an entirely different set of beliefs and values about how government and society should function.
They have no principles and no internal logic because subjectivity is elevated and objectivity is shut out. For example, if you were analyzing the issue of police on black violence, statistics and data analysis would be entirely ignored in favor of the subjective "lived experience" of whichever black person's opinion they deemed worthy of answering the question. I'm just making this up for example purposes, but if data showed that police killed black people in 0.001% of all encounters but random individual John Doe felt targeted and unsafe as a black man living in America, the data would not be used to assuage his fears but the inverse would be true and his opinion would be found to confirm the existence of a police genocide over any and all data to the contrary. Even the question of which subjective opinion should be taken as truth is answered subjectively....obviously(except maybe to Biden) not all black people think alike. So if a black person like John McWhorter comes along with a different lived experience or opinion that doesnt fit the desired conclusion, it's just explained away, for example as internalized white supremacy.
James Lindsay has a great book called Cynical Theories if you want to understand more.
Of course this isn't the view of all Democrats, but it definitely is the position of the upcoming base of progressives/leftists.