Maybe it's just me but the book-Elves (Lothlorien) might be a bit stand-offish and unused to strangers but at least they're courteous. Yes they have the "dwarf breathing so loud" line in the book, but they say it to Legolas not to the whole company. And it's not the first words out of their mouths. In the movie they're looking down their noses the whole time that we see them. Maybe their "image" would improve if the Lothlorien scenes were expanded.