Why do people hate poor people?

Some think they have no worth or purpose in society because they have little or no means to get by, and others believe because of their status in poverty, they will only be detrimental to others by resorting to crime and dishonesty.

For the same reason people hate wealthy people; some think they have no real worth or purpose in society because they (insert class bias of your own choosing), and others believe because of their elite status in society they will only be detrimental to others by (insert random stereotypes). One Word to sum it all up; bigotry.