I'm inclined to use parvenu but most meaning suggest about lacking refinement. I'm looking for someone who looks down on the poor. Maybe abusive to the poor.
"People who are toffee-nosed consider themselves to be better than other people, especially than people of a lower social class: He's a toffee-nosed git - take no notice of him!"
nouveau riche TFD
n, pl nouveaux riches (often plural) a person who has acquired wealth recently and is regarded as vulgarly ostentatious or lacking in social graces