Well pretty much as the title states, I was wondering if it's ok to ask about the code of conduct in the gym.
Etiquette is such a subjective beast. There is no official source that tells me what is acceptable and what isn't in a gym or in any social setting. The answer varies from culture to culture, club to club, and even from person to person.
There are some clubs where doing X may be looked down upon and other clubs where participating in that same behavior is simply overlooked, which implies that it's unofficially acceptable.
For example, some clubs require you to wipe down the equipment when you're done, some don't. In some clubs, people are more respectful and just clean up after themselves because that's how they were raised, and in some clubs people just do whatever they want, regardless of what "rules" are listed on paper.
It seems that this particular topic would just encourage a lot of discussion, something SE sites aren't designed for.
That's not to say that expanding the scope is a bad thing or that your points aren't valid, it's just that in this particular case, questions about etiquette just don't seem like they would be a good fit for a network dedicated to being an objective resource of knowledge in the form of answers to actual problems you face.
I think such question could be ok, and if anything, we should decide on a case-by-case basis, not make a blanket rule. I agree with jmort253 that the answers will be subjective (whether due to culture, habit or rules), but the community can still up-vote what makes sense and down-vote silly policies. Programmers.SE is also very subjective, and no one complains about that.
They feel ettiquette is something that can be generally outlined, and they even address Calvin's question. And as they say, "ExRx.net is a recommended resource in ACSM's Resource Manual for Guidelines for Exercise Testing and Prescription, 5th ed." so it can't be argued that they're not a valid source.
Calvin can ask his question, and someone can link to ExRx, quoting the relevant bit. How does that not fit into Fitness.SE?