Serena Williams argued with the chair umpire, September 8, during a match against Naomi Osaka, of Japan, during the women's finals of the U.S. Open tennis tournament at the USTA Billie Jean King National Tennis Center, in NY.
Fast forward a day, and they're not backing down.
It is not clear if Twitter has censored him or he deactivated account himself.
"What's unusual is the assumption that cartoons are this innocent domain which has been overtaken by politically correct, left-wing types, when in fact cartoons have ALWAYS been vehicles for racist, colonial and nationalist themes.
I simply saw the world number one player having a dummy spit".
'Personally, I am with you there.
"The cartoon about Serena is about her poor behaviour on the day, not about race".
Going by the dictionary meaning, a "cartoon" is a simple drawing, showing the features of its subjects in a humorously exaggerated way, especially a satirical one in a newspaper or magazine. This is what he does for a living and we've all appreciated what he's done over the years in all different cartoons.
The National Association of Black Journalists said the cartoon was "repugnant on many levels".
"But those who seek to prosecute their antiracial agenda by identifying racism in the Knight cartoon - where it does not exist - completely miss the point of the drawing".
"It rightly mocks poor behaviour by a tennis legend", Johnson tweeted. "It's nothing to do with race".
"I'm here fighting for women's rights and women's equality", Williams told a post-match news conference. "She's powerfully built, she wears these outrageous costumes when she plays tennis - she's interesting to draw", Mr Knight said. "This classic Jim Crow era sexist/racist image does nothing but display the complete disrespect of the superstar and perpetuate the stereotype of an "angry black woman" I am appalled", wrote Jevin Hodge, the vice-chair of the Arizona Democratic Party. "Well, she does have her hair dyed blond". "You can't punch down these days".
"Freedom of speech doesn't mean freedom above criticism", she said. Do you really think 76ers star Ben Simmons is constantly trolling the internet just waiting to be outraged as part of the PC Police?
Serena Williams is yet to comment on the cartoon.