That girl you just called a mudblood? She spends hours every day practicing spells hoping people will like her. That boy you just stupified? His parents use the cruciatus curse on him regularly. The guy you just made fun of for crying? His mother was killed by a death eater. That kid you just pushed? Hes trying to use the killing curse on himself. Words hurt. You never know what its like until you fly a mile on someone elses broom.