I don't consider myself uptight - although some might disagree - but I am not of the mindset that simply paying to stay at a high-end hotel or resort entitles one to dress or behave in an inappropriate fashion that disturbs others.
Unless you are in the confines of your own accommodation, and out of sight and earshot of others, there are common sense standards that need to be respected when one is sharing public space with others.
It is really more about behavior and manners than about attire.