I don't think white/black is the issue at all. Caitlin Clark smiles, acts like she's happy to be alive, has a great social media game, and has an unusual skill set. Most WNBA players on the other hand take pride in being unapproachable, surly harridans who use their very limited camera time to angrily scream about oppression. Why's that a problem? Well, your average Joe works too many hours, has a few kids, and worries about money and job security in this dog sheet economy. Neither he nor I wants to waste very scarce free time listening to some hag tell us how awful everything is and how complicit we are.
And there are so many examples of non white people who follow the Clark pattern and are popular. Look at Von Miller. Dude does his goofy sack dances, shows up to interviews in his big nerd glasses and then grins and jokes, and uses his spare time to advance his charity. That makes me and average Joe feel good and happy, not mad, so everybody loved him. Cam Newton is another example. He showed up to press conferences looking like it was a pit stop on the way to a pimping convention, grinned and joked with the reporters, etc., and it made him very popular. (He's honestly SO dumb that he hit a bit of a glass ceiling, but that's not the issue.) Really I think Clark is popular because she's unique, capitalized on her uniqueness, and avoided anything off-putting. That's it.
The woman quoted in the OP who said it makes her "blood boil" doesn't realize it, but she's spinning the feedback loop faster and faster with her behavior. If you're angry and nasty all the time, people aren't going to like you, and if you're waiting for people to like you before you dial down the anger, it's never going to happen.