I'm secure in the knowledge you like to move goal posts when your argument falls apart.

That's the thing. You shouldn't be.
Your whole argument is based on the idiotic premise that because he stated his belief that people would be thinking differently 40 years from now, that it must somehow mean they haven't changed their beliefs at any point in the past.
Thinking differently in 40 years doesn't imply in the slightest sense that the current state of thought has remained static throughout history. The existence of a billion dollar diet industry doesn't imply in the slightest sense that social attitudes toward obesity are locked in place for the foreseeable future.
It was a sad attempt at rhetorical logic, backed by boneheaded self-assurance.
Guess we know who bought his law degree from a second tier state school, don't we?