"Belt color" is the most meaningless thing in all of sports.
Anyone who thinks it is remotely relevant to a fight is a complete moron. Your neighbor's 16 year old kid is a "black belt" in BJJ from the martial arts studio between the Subway and Supercuts, and Joe Lauzon is a purple belt. Sounds like that 16 year old should have been in the UFC several years ago....
It cracks me up how Joe Rogan thinks belt color means a damn thing. Matt Hughes was beating the crap out of BJJ black belts for years, and he didn't even have a belt in BJJ at the time (if ever, I forget). Rogan recently "earned" his black belt... so obviously he could defeat over half the fighters in the UFC in his weight class (though a "black belt" should be able to defeat anyone regardless of size, after all that's what BJJ is all about).
There's a great Penn & Teller: BULLSHIT episode on martial arts. Most of it is about frauds who claim they can knock out people by throwing "chi power balls" (literally like in Street Fighter II - hahdoooken!) but colored "belts" is also a big part of it. Want your black belt? Respect the dojo - so go clean it, including the toilets and locker-room - and don't forget your dues need to be paid at the beginning of the month. Paying some fraud $100 a month for the privilege of providing free janitorial services = rise to black belt.
If you've got a colored belt and take it seriously, and are thus offended by this, too bad. Skill, ability, athleticism, and natural talent are what matter, and no matter how respectable your instructor(s) may be, the "colored belt" you have says absolutely NOTHING about those qualities.
The notion that anyone fighting in the big league of the UFC is anything less than a "black belt" is laughable and should make everyone with half a brain realize that belts mean absolutely nothing. The color of a fighter's pubic hair is more relevant.