srsly.
I listen to hardcore music (metal, melodic, melodic death, etc) training because the fast paced stuff keeps me moving fast and pushing hard.... but its literally just moving weights back and forth for and hour and a half. It makes me sweat and its somewhat straining but its not really hardcore or grueling at all compared to the military training or mixed martial arts stuff ive done.
I think BBs want to think theyre tough and hardcore because of their personality disorders and insecurities, but there is NOTHING hardcore about moving weights back and forth, eating strictly, and donning a thong to show other men your body. Period.
When you have many Americans who are either overweight or just skinny fat twinks---lifting weights, or even dieting is akin to going into a death camp, it says something about the average person's resolve. And when you have ex-military who just let themselves go, or lack the drive to maintain a decent physique, it says something as well.
Then, you have the Ronnie Coleman factor. He was "hardcore" because he enjoyed lifting, he enjoyed bodybuilding. That was his passion. He wasn't lifting heavy ass weights to impress people, and that is why he was "hardcore" about it. His passion came out.
Most of these "hardcore" people are just what you said. Plus, people today want the imagery of "hardcore-ness" because I believe that they have never truly defined themselves beyond that imagine that they try to project.