Ron was in a very bad temper by the end of the class.

‘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.