The wizards represent all that the true 'muggle' most fears: They are plainly outcasts and comfortable with being so. Nothing is more unnerving to the truly conventional than the unashamed misfit!
Raindrops the size of bullets thundered on the castle windows for days on end; the lake rose, the flower beds turned into muddy streams, and Hagrid’s pumpkins swelled to the size of garden sheds.
Hermione drew herself to her full height; her eyes were narrowed and her hair seemed to crackle with electricity. "No," she said, her voice quivering with anger, "but I will write to your mother.