condescending

adj. behaving as if you are more important or more intelligent than other people.

adj. showing or characterized by a patronizing or superior attitude toward others.

“I found his tone very condescending when he explained the simple instructions to me.”

“The professor’s condescending manner during the seminar alienated several students who had valid, albeit unconventional, perspectives on the text.”

v. doing something that you think is below your social level or importance.

v. the present participle of 'condescend', meaning to waive the privileges of rank or dignity to interact with 'inferiors'.

“She felt she was condescending by helping with the basic cleaning tasks.”

“By condescending to attend the local village fair, the duchess hoped to improve her public image among the rural electorate.”

Formal