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Robinson, making his pro boxing debut on the undercard of Mike Tyson vs Roy Jones Jr, was savagely knocked unconscious in the second round by YouTuber Paul. Mayweather showed his support in the aftermath, sharing a picture of himself and Robinson on Instagram.
However Mayweather also appeared to criticise "black athletes or black entertainers" who might be poking fun at Robinson's expense.
"Nate, I'm proud of you and I will always stand behind all my brothers. I will never kick my brother when he's down," began Mayweather.
"It's ok for people to voice their opinions on social media, but no black athletes or black entertainers, especially black NBA players should make a mockery out of you.
"We are supposed to all stand with each other through the good, bad and ugly. I'm here to uplift you and let you know we all love you and congratulate you for just making an effort."
Mayweather's message could be seen as a criticism of the likes of Snoop Dogg, who commentated on the fight in outlandish style and sang when Robinson was trying to get to his feet following his first knockdown.
LA Lakers superstar LeBron James praised Snoop for his commentary performance on Twitter, while former NFL star Shannon Sharpe went a step further.
Sharpe took to IG following Robinson's loss to say: "Told you not to take this fight. Plus you're wearing Knicks colors, WTF did you expect to happen."
'King' James responded with laughter, so clearly there isn't universal sympathy for Robinson's predicament.
Mayweather - who's not shy of a bitter feud or comment himself - did add to his post: "The times I've had issues with another brother is when they came at me first. I was just defending myself."
The 50-0 former pound-for-pound great clearly believes black athletes should be standing up for Robinson. An alternative point of view is that he put himself in this position and is not the first boxer to suffer an ultimately humiliating KO defeat.
Featured image credit: Instagram @floydmayweather
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