Managing expectations--yours and others'--is a social skill necessary in and out of the LS--but perhaps more especially in the LS. The nice thing about the LS is that candor is not only appreciated but also in fact expected. That does not negate the need for social graces--in fact that candor raises the bar. As AndrewandAnn--and others--have remarked, rejection is by far the most common response and if you are going to be in the LS, it's important both to accept rejection gracefully and give rejection gracefully.
Learning to read "no thank you", learning to say "no thank you", all the while ensuring that those expressions are unambiguous yet feel non-confrontational---all of that is hard.
It is always appropriate to be respectful and courteous. It is always appropriate to be friendly provided that those signals are not misinterpreted. We learned a great deal about how to read people, listen to people, and gauge intentions when we attended our first clothing-optional resort. Some were there simply to enjoy social nudity, some were there because LS people were also welcomed. All were gregarious and all were enjoying their clothes-free status. We made friends with with groups, and at the same time needed to learn different sensitivities.