First of all, just to call it out here, I object to the title of the thread and the obvious racism to some of the posts inside the thread. I know it's just a message board and folks will do as they like, but I still object.
With that said, as for this incident, neither the chair umpire nor Serena are without blame. Sure, the ump was following the rules to the letter, but Serena is right that those rules, especially the coaching from the stands, are not uniformly followed nor enforced. Heck, the WTA even has different rules on this for women's matches that are Grand Slam events versus those that aren't. And the ump has the discretion to warn Serena without giving her an actual code violation, and he has the latitude to tell her discreetly rather than making the announcement as he did. Refs shouldn't interject themselves into big games anymore than they have to, and he had options here that would've done the same thing without helping to escalate it.
However, Serena does deserve a lionshare of blame on this. She has a long history of losing her temper, and losing her temper at the US Open (her threat to a lineswoman a few years back about stuffing a %&$* ball down her %&$* neck was so far across the line you couldn't even see the line any more). She behaved like a petulant, pampered prima donna athlete, which, in this country, we have way too many of across way too many sports. She carried on well past what was acceptable, she continued to escalate the dispute almost entirely on her own, and did so more and more once it was clear that she was the second best player on the court. She entirely spoiled the moment for the first time Grand Slam winner by making it impossible for her to enjoy the moment (and yes, the crowd deserves blame too - American tennis fans tend to be a tight circle of privilege and they don't see outside their own bubble often). And she doubled down further on it by calling her treatment sexist, and even seemed to want to be exonerated for past temper tantrums that happened years ago.
I feel this way when baseball players storm the field like children for a brawl, when football coaches get so incensed about a call that went against them that they storm on the field and throw things, and any other number of just flat out childish actions by athletes and coaches. Grow up. Control your temper. You can be a driven and focused athlete or coach and still behave like a grown up when adversity strikes. Maybe even Serena can get there someday.
Proud Member of the Blue Hen Nation