Dorian Yates is referred to as a blue collar bodybuilder. Shelby Starnes and John Meadows have a podcast called Blue Collar Muscle.
With that said, what makes a white collar bodybuilder?
I'm thinking Phil Heath and Jay Cutler are white collar--likely cologned and smelling like roses throughout the workout, little strain, pump/high-rep training, sets stopping short of failure, moderate weights, no busted joints or crippling afflictions, and ultimately come out of the bodybuilding journey unscathed, "marketable".
Blue collar: busted joints, every sort of side effect imaginable, heavy weights with low reps, sets to failure, permabulking, HIT/DC training for some, spider and varicose veins in places other than the legs where they are usually not found, handicapped post-bodybulding, socially stunted, dabbling in powerlifting, "unmarketable".