"It's no wonder no one can stand her," he said to Harry as they pushed their way into the crowded corridor, "she's a nightmare, honestly."
Someone knocked into Harry as they hurried past him. It was Hermione. Harry caught a glimpse of her face -- and was startled to see that she was in tears.
"I think she heard you."
"So?" said Ron, but he looked a bit uncomfortable. "She must've noticed she's got no friends."

Harry Potter and the Philosopher's Stone - Chapter 10 : Halloween
See this quote in the Pensive -