Toney is a perfect example.
I've seen boxers, wrestlers, and bjj guys all think their art of choice is superior to MMA. People wrongly assume that all BJJ guys do MMA. Even after all MMA has proven, there are still purists. Styles have weaknesses(that's why MMA uses best from all). For example, wrestlers naturally give up their backs because that works in wrestling. Against a guy who knows BJJ, it leads to doom.
Not only can't boxers defend takedowns, they usually have no ability to defend or pass guard. Can't use guard when taken down. That can lead to a fucking mess.
I think boxing purists are the most vocal because of the way MMA tries to force standup for the casual fan. They also wrongly assume MMA guys are trying to be boxers or show off boxing. It's all in the game. Boxing guys are free to go to the local MMA gym and try to spar MMA rules. Closest thing to a street fight. It won't be pretty.