My opinion is that it's a retread of an existing topic only the question is even more loaded than last time. Superficial traits like skin color or state of wealth or lack thereof are not indicators on a person's ability to fight. The most ironic thing is that America's poorest settlement is in New York state and it's Jewish, not black. So much for the destitution makes for vicious fighters trope. Furthermore, the question is loaded as it means to attract people by way of trolling both those who'd be offended by generalization and bigotry and by those who already assign positive values to themselves and negative to others merely by being something, not someone.
The site has actual fighters, hence why a page to connect for them with each other exist, and they're the closest to being an authority on the matter, but I suspect even they know the difference between a competition and brawls put on YouTube. Constantly winning can lead to hubris, constantly losing to depression, and in between exist experience, battle readiness, pain tolerance, the affinity to play fair or dirty (excluding cases of genuine self defense and fighting for survival), how quick they think on their feet, temper, anger management, just to name a few of the crucial factors that decide if a fight happens how it happens and how it ends.