Real Dictionary

moralize
verb: If you say that someone is moralizing, you are critical of them for telling people what they think is right or wrong, especially when they have not been asked their opinion.

moralize in American English
to interpret or explain in terms of right and wrong
to think, write, or speak about matters of right and wrong, often in a self-righteous or tedious way
intransitive verb: to reflect on or express opinions about something in terms of right and wrong, esp. in a self-righteous or tiresome way
transitive verb: to explain in a moral sense, or draw a moral from

moralize in British English
verb: to make moral pronouncements