Why are So called Christan's calling non belivers names?

People are constantly yelling at people who want answers about christianity or are confused. Why arent they loving them like we are suposed to, be gental, and answer nicly. Please, answer me, Why are all of you so cruel to non belivers? I dont want to be accociated with you if you keep giving christianity a bad name, it makes it hard for me to testify to people.