Characters in these movies are almost always snide, sarcastic, cynical, full of cutting wit at inappropriate moments...Just plain obnoxious. I've never known an older vet (WW2, Korea) who was like this. I found myself thinking the same thing I was thinking during Inglorious Bastards -- would somebody shoot these jerks already!
Historical movies are only historical about the viewpoint of time they were actually made. So say Birth of a Nation is historical of D W Griffith’s view in 1915 not of reconstruction. Spartacus is historical of Kubrick’s view in 1960 not of ancient Rome. Inglourious Baterds is historical only of Tarantino’s fantasy world in 2009.