That Ref is a hardass (and has been in the past). She was being a petulant child and took away what should have been a great moment from Osaka who legitimately kicked her ass. Straight sets and neither set was close.
Serena's coach said he was coaching her. Straight up said he was. And did it blatantly enough that the ref noticed and felt it deserved a penalty.
Serena then SMASHED HER RACKET later in the match. Costing herself the point. The Ref didn't make her smash her racket. And then to take that frustration out on Ramos, who doesn't take shit from anyone in Tennis, is her fault again. He has put Murray, Venus, Nadal and Djokovic in their places as well. He is a hardass.
This wasn't sexism. Her claims that it is sexism makes me like her so much less. This was Serena getting her ass kicked and trying to use her Stardom to intimidate the ref and her opponent because she knew that was the only way Osaka wasn't going to kick her ass. It didn't work and now Serena is crying foul.
Osaka has at least handled this very gracefully.