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If Kyle Busch is known for anything else besides winning, it's his temper. He has an attitude that is worse than his older brother's, and yet while the bad attitude thing works for guys like Kevin Harvick and Tony Stewart, it doesn't work for Busch.
Busch isn't satisfied when he finishes second, and that is fine. However, his short fuse has led to more tantrums than blowups, and that is one reason many fans accuse him of whining. However, Busch has been known to blow up on other drivers who may be considered "smaller" in the NASCAR hierarchy.
He's famously feuded with David Reutimann as well as a run-in with John Andretti at Texas Motor Speedway in 2009 that ended poorly for Busch. In 2009 following the August Nationwide race at Michigan, Busch had another run-in with former Hendrick teammate Brian Vickers.
However, following a 2008 Martinsville truck race, Busch ran from the angry crew of Johnny Benson after Busch wrecked Benson and several others on the last lap, and following the 2011 Sprint Cup race at Darlington where Busch turned Harvick, he proceeded to run away from Harvick when he chased after him.
Busch's passion is evident when he leaves the track after finishing second without saying a word, but his shenanigans can get him in trouble when he drives tough but fails to back it up by running from other drivers.