I don't think Frank is hating on anyone. He just didn't do a good job of making that clear in his initial post. The complaint he is voicing is more about the way some of those guys think they are too cool for school in the gym environment. I know how obnoxious that can be, especially where I workout. Those guys know nothing about game and regular life, but think they are hard and significant because they can lift a lot of weight. Some of them aren't all that bad if you talk to them, but the ones who are bad are right-out obnoxious. We have a word for them where I am from: Meatheads or Meat****s.
The same dynamic can exist for bouncers in a bar or a club. Some bouncers relish in the power they hold and are jerks about it because very often they don't hold much power in any other realm of life. That's especially annoying because in real life probably you, me or anyone else on this message board could out-game or out-do any of those kinds of bouncers. I got into a fight with a bouncer once when I was younger (wouldn't recommend that) because he was being a jerk-off.
If one of those meat****s is screaming and grunting unnecessarily during a workout just to draw attention to himself, I've found the best thing to do is just crack a joke about it to the people around you to ease the awkwardness, say something like "was that guy giving birth back there?" I also think Joe gives good advice, just smile and ignore it.
Frank, I wouldn't pay too much mind to the hater or jealous accusations. You seemed defensive about that. In every thread on this message board, there is always going to be someone who responds and tries to play psychologist by reading wayyy too deeply into a couple of sentences. Five times out of six, the person is way off-base. Only you are going to know if you are actually a hater, not some guy who has never met you and is judging on the basis of an Internet message board post. On a message board forum, you have to learn to sift through the bad advice and the good advice. Besides, if you think it's bad here, you should try posting on the regular Don Juan message board.