He professed to be so hurt by his treatment in Pittsburgh, where Chuck Noll wasn't sensitive enough to his feelings (Noll was stearn and aloof with all the players), and because the home fans cheered once when he was injured. That's pretty sick, but it's happened to a lot of quarterbacks when they were playing poorly. Other than that one incident he was the toast of the town once the team became championship quality. But he was the one member of the Super Bowl teams to cut all ties with the city, refusing to attend reunion events and other functions, and refusing to speak to Noll, until the past couple of years.
And Bradshaw was actually the weak link of the Steelers first two Super Bowl champions. Check out his career stats, especially his first few years; he was lousy. (Six TD passes and 24 picks his rookie year of 1970; he didn't throw more TD passes than INTs in a season until 1975.) He was the beneficiary of a great cast around him on offense and defense, and he finally did develop into a great quarterback. Of course he should have as he was an athletic freak -- strong as a bull, super-strong arm, and excellent mobility and running ability. The main knock on him was the one that he is supposedly so sensitive to -- that he's dumb -- yet as noted he loves to play the buffoon on TV as he has little of value to say as a serious analyst or commentator.
And yeah, he not only loves those black quarterbacks, he even refers to their "God given talents." Apparently white quarterbacks are shunned by God in Bradshaw's eyes. Or maybe Bradshaw sees a lot of himself in black QBs -- allegedly "gifted" athletes with limited mental acuity!