talk down to (someone)

Translations
разговаривать свысока с (кем-то)
He tends to talk down to his colleagues, which annoys them.
Он склонен разговаривать свысока со своими коллегами, что их раздражает.
Definitions
To speak to someone in a way that shows you think they are less intelligent or less important than you; to address someone condescendingly.