WordNet sense 1 (lack of respect accompanied by a feeling of intense dislike):

contempt, despite, scorn

WordNet sense 2 (a communication that indicates lack of respect by patronizing the recipient):

condescension, patronage

WordNet sense 3 (look down on with disdain):

contemn, despise

WordNet sense 4 (reject with contempt):

pooh-pooh, spurn, reject, reject, turn down, freeze off