Bullshit. I've been to Bosnia last year, also Srbia, Albania, Macedonia... I've met cool people and had a great time there. I was in Sarajevo, Mostar and Srebrenica.. you can see the traces of war pretry much everywhere, but I never had a problem and had a great time.
I'm from Czech republic btw (NATO country)
edit: I've met few Americans and Australians too and spent few days with them in Bosnia.. no problems at all.