There is an ART to being a good guest as well as being a good host. Each one in turn should practice to perfection.
You are 100% correct.
I think, however, that part of the mitzvah of hachnosas orchim is putting up with the idiosyncrasies of your guests. Many people who are in need of meals (although of course not all) have issues which are the cause of the reason that they need a meal to begin with! The highest level of the mitzvah is to tolerate rude behavior (although not at the expense of your family, as in the guest which Oomis had). Just read All for the Boss!