The boos rained down on Busch as he celebrated his 10th Nationwide victory of the season, and second since arriving at Bristol on Wednesday. He won the Truck Series race, and will try to make it a clean sweep tonight in the Sprint Cup Series race.
Busch is the defending champion of the Cup race.
He had to work hard to get the Nationwide win, battling for at least a dozen laps with Keselowski for the lead. He finally made the pass with 31 to go, but as he slid in front of Keselowski, Busch didn't have him cleared and contact between the cars sent Busch down the track and back to second.
"I raced him, raced him, raced him, I don't know, 12-15 laps? I thought I had him cleared up the back and I moved up in front of him and instead of him doing an (Dale) Earnhardt crossover, he decided to just run into the back of me and put me in the fence," Busch said.
"That's Brad Keselowski. So I went down into the next corner and I dumped him. He does it to everybody else, why can't I do it to him?"
The crowd showed its disapproval with strong booing toward Busch, who changed his trademark victory bow for a mock wiping of his eyes like a crying baby.
Keselowski is on probation with NASCAR for a series of on-track incidents with Carl Edwards, and said he thought Busch took advantage of that because Keselowski has "my hand tied behind my back," when it comes to retaliation.
DANICA RETURN: JR Motorsports expects to field a Nationwide Series car next season for Danica Patrick.
JRM co-owner Kelley Earnhardt said Friday she's waiting for the IndyCar schedule to be released to determine how many races Patrick will drive in NASCAR. She's running a 13-race schedule this year for JRM that is built around her IndyCar commitments.
Patrick has a career-best finish of 24th at Chicago in July through her six races so far.
Earnhardt also said her brother, Dale Earnhardt Jr., will run between four and six Nationwide Series races next season in the No. 7 Chevrolet that Patrick drives.