come on as
come on as (something)
To be seen in a particular way by other people. Molly comes on as a very cheerful girl, and that's truly her personality—you'll find that out once you get to know her better.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
come on as something
to appear to be something; to project one's image as something. The senator comes on as a liberal, but we all know better. He comes on as a happy guy, but he is miserable.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.