Sentence:  "None of your business," she said. She can be very <WSD>snotty</WSD> sometimes. She can be quite <WSD>snotty</WSD>. "I suppose you failed in every single subject again," she said—very <WSD>snotty</WSD>. It was sort of funny, too, in a way. She sounds like a goddam schoolteacher sometimes, and she's only a little child. 
Meaning of the word marked with <WSD> tags:  Ill-tempered or impertinent in an arrogant, conceited manner.