I was always under the impression the term "assault rifle" referred to a fully automatic or select fire rifle...has nothing to do with our AR-15s that are semi automatic.
Give the new kid a little time he will learn. Though by definition yes you are correct. Though if you want something that will make your head hurt think about this. In the news when a civilian uses an AR15 to defend themselves they shoot whomever with an assault rifle, however, whenever a police officer uses the exact same rifle it is suddenly a patrol rifle. Think about.... a rose by any other name... not when the media is involved.