I honestly believe they are all trying to out-troll each other on that bodybuilder forum. It is the only plausible explanation.
I hope this is true.
However my small window into this bodybuilding world (my local gym) tells me these dudes really exist. At any time you can run into one of the following;
1) Mr. OMG you're black! time to go straight thug in my zubaz half pants.
2) Mr. I talk down to women all the time, slut shaming is real bro
3) Mr. My arms are 20 inches around but my legs are about 10....
4) Mr. Beta males bother me, I'm alpha dog (then goes to his job waiting tables at applebees)
5) Mr. One girl in the gym? Time to simp that.....I'm so thirsty
6) Mr. Short guy syndrome "I will fight any dude in here if they say shit about how small my shit is"
etc
And that's just one local gym.