They know that Biden won't pick a conservative Republican nominee, but they find it a lot easier to oppose a black woman than a white male nominee. And they can sell that as just voting against the nominee on ideological, rather than racist, grounds. It would be a little harder with a white male nominee.
Justice Garland can certainly confirm that.
You have conveniently forgotten that Garland was never even allowed a hearing. His nomination never came to a vote. Why was that?
Um, because McConnell didn't have to allow it? Because he wanted Obama not to get a SCOTUS appointment and having no hearing was the simplest and easiest way to stop it? Because if he held hearings then Republican stonewalling would be on TV making Republicans look dickish 24-7 through the course of the hearings, instead of over and done with after one dick move?
McConnell wasn't going to take any chance that members of his own party would vote for the man. Why was that? Had Obama put forward a black female nominee, McConnell might not have been so nervous.
That's a fanciful explanation. If you think McConnell wouldn't have pulled the exact same dick move on a black female nominee, what, seriously? Dick moves are kind of his speciality.
Obama had picked Garland precisely because he was white male moderate who was popular with both Democrats and Republicans.
But it’s so simple. All you have to do is divine from what you know of Republicans: are those nervousness-inducing criminals, who were used to McConnell not trusting them as he is not trusted by you, the sort of men whom Garland would be more popular with than some generic hypothetical alternative one of their Democrat enemies would be, because Garland was white and male, or because Garland was moderate?
Plato, Aristotle and Socrates are morons compared to you; we'll take your word for it that McConnell would surely have held hearings if only Obama had nominated a black female moderate.