Well that was quite the ad hominen argument. Weight room etiquette is the same as common sense etiquette. Would you go into someone's house and move their stuff around and then leave? Didn't think so.
I absolutely commend people for trying to improve their fitness. But a lot of people have zero manners in public. All us "veteran elitists" are asking is if you get in the way, say excuse me. If you pick up weights, put them back in their proper place. If you leave sweat on the mat/bench, wipe it up. If you move someone's weight, put it back. Not too much to ask, correct?
I agree with everything you said, but I do believe there are many people at the gym who are entitled and rude.
The things you mentioned are things that are worth getting mad over for sure. However, I see a lot of entitlement at my gym. Like I mentioned earlier, it's generally from groups of young guys that are together. They're irritated because a new guy is on the machine they need, and you look over and every single one of them is staring and whispering quietly. That's annoying. I get it, I was once young (still am somewhat I guess, 27) and cocky/confident before, but I never looked down on people trying to better themselves. I think there are many that do.