I don’t disagree, but it’s like asking a woman who she would rather be alone with, an unknown man or an unknown woman. There’s also familiarity bias and having more in common. I don’t think I have to be racist or prejudice to know there will in general be less friction with a white dude vs a black dude, because that’s just most people around me. I still try and ignore that because I know it’s limiting my experiences, but there are good reasons that I wouldn’t ascribe purely to prejudice.

Also for the wheelchair example, I again think there are reasons for this. For the person in the wheelchair you often don’t know why, did they have a stroke and can’t speak? Are they ill? Or did they just hurt their leg? I’m not saying people wouldn’t be biased against the disabled even if that weren’t true, but a lot of these have legitimate reasons that aren’t just prejudice (maybe the dictionary definition but not irrational prejudice).