patronize — as in: Don’t patronize me.
I’m annoyed by her patronizing tone — as though she knows more about my situation than I do.
treat in a manner that demonstrates a sense of superiority, but is supposed to seem kind
the actions of a patron (to support someone or something; or to be a customer)
More rarely, patronize can mean to "give business to" as in "I don’t patronize that restaurant because the owner is rude."