Well I am at college, so I didn't bring any of my posters because of this exact reason. I do though have a ton of little LOTR things that I brought with me (bookmarks, pins, keychain, lanyard, etc.).
But I completely understand what all the other young girls on this board have been going through. In some ways the LOTR has been hijacked by the people who went straight from Titanic, to boybands, to LOTR. So thus all of us who are not those type of people, who are the people who enjoy the films, but are primarly into the books are instantly being labeled. And, yes, this does make me angry
(well maybe not that angry)
But, yes, just ignore them. Whip out your copy of the Sil and just walk away