That whole thing in Pumping Iron was a set up for the movie. When Waller, Robinson and Callard were talking about taking his lucky tee shirt that was filmed months after the competition in Africa.
Katz was an animal athlete. One of the fastest linemen on the NY Jets. Ran a 4.6 in full uniform on grass as a lineman. I doubt he was intimidated by Ken Waller who wasn't signed out of college football like Mike was. Is he a sensitive guy? Sure he comes across that way but make no mistake back in the day he could bring it when needed.
The interview was fantastic. He owns several Planet Fitness gyms and says they are beginner gyms that made him more money then when he owned a World Gym.
He was a school teacher, married with kids when he was competing and that's when the majority of guys at Gold's didn't have a job or a family.