The crowd booed him. He called his car pathetic. His crew missed a lug nut, and he couldn’t stay off Darlington Raceway’s wall. Despite it all, Kyle Busch found Victory Lane once again. NASCAR’s least popular driver raced to his third Sprint Cup Series victory of the season Saturday night, winning a battle of attrition at the track “Too Tough to Tame.”Busch’s victory hardly thrilled the crowd, which viciously booed him in prerace introductions and hadn’t softened by the time he took the checkered flag. Already loathed by many, he enraged Dale Earnhardt Jr’s massive fan base by wrecking him as they raced for the win last week in Richmond.