Not 'any' criticism. Criticism, that doesn't appear to be justified. Criticism that appears to be paltry, mean spirited, mincing, overly exacting for the supposed topic of critique and thus unfair.
In Serena's case this sort of critique has been a mainstay feature of her career. If you're a poc you feel it. And you know it when you hear it. The same thing happens with other female women of colour achieving and doing well in other fields.
I don't think anyone here is a racist. But I do hear some bias in some of the comments. We all have bias. I definitely have bias when the subject involves someone rich and wealthy for e.g. actually, maybe especially someone rich, white and wealthy born into wealth. I have to check myself and ask myself (and sometimes God) if I am being truly unbiased or reacting to my own stereotypical schemas, or if the topic is swinging in that direction to begin with. We can get over our biases when we actually listen to others who accuse us of it and question if they might be right. And even if we think they're wrong,question why they feel that way. What is it that they see or experience that has passed by our own perceptual abilities. Why are they being defensive? I have found there is always some basis for it, even if I don't accept it fully.
It's pretty sad to me that any person can achieve all that Serena has coming from where she has, and yet face this sort of trivial criticism. She is the very embodiment of the often quoted 'you can be anything you want to be with determination and hard work' that flippantly bandied pro-capitalist quotation, a leader in showing women can level up a sport in the same way men can, and yet there is almost a kind of spiteful enjoyment and contemplation in her failure. We Brits do tend to enjoy hashing over the well to do failing, we're unlike Americans in that way, it's definitely a feature of the culture, but in Serena's case seeing articles and commentary over the years, that has been amplified and that is because of her class, colour, and sex.
So there shouldn't be this naive 'oh how can you possibly draw that conclusion, you're so awful' as if it hasn't been happening and we don't live in a world where being non-white doesn't exert any pressure and doesn't drive any narratives.