What I have found is that most of the MMA meatheads tend to fans, not people who train. When it is people who train it is usually those that haven't trained very long and haven't done enough sparring/rolling to get over their ego. Once you have been doing it awhile you get over the winning/losing thing and start to think of it as training and both winning and losing are good if you learn something.
Also you get banged around enough training that you begin to realize how dangerous a real fight could be.
BTW, just because he wears a tapout shirt doesn't mean he trains.