Use the word snooty to describe someone who is a terrible, stuck-up snob. Your snooty grandmother might refuse to take the subway because she doesn’t want to mix with regular people.
Snooty people generally think they’re better than everyone else, often because they have more money or believe they belong to a higher social class. A snooty college freshman might demand a single room in the very best dorm, and a snooty waiter in a fancy restaurant might make you feel like you don’t belong there. Snooty first appeared as college slang in 1918, from the now defunct 1800’s word snouty, which implied “looking down your nose at people.”