I'm sure this won't be a popular pick, but I'd throw Nick Diaz's name into the ring as far as disrespectful fighters go. He rarely if ever gives his opponents credit, especially after fights he loses. Instead, he accuses them of greasing up (Sanchez), attacks them in the hospital after the fight (Riggs), whines that they used takedowns to win (Sherk), or simply complains that the refs are crooked (Parysian). Even after beating Gomi in a great fight, he proceeds to repeatedly call him a little Jap.
There is no denying how tough and talented the guy is. But he can be awful disrespectful at times as well.
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