Oh, someone is there. Enjoy that very human looking face looking up at you, Optimus. Even though the majority of Miria's body is not human looking. You know, with the space jet robot parts.

And even if Optimus was being patronizing, she wouldn't have realized it.

"... This Unit was trying to not be spotted," she replies in a matter of fact tone. "In case the Cybertronian is hostile."

Even after meeting some nicer Cybertronians she is still being cautious, sorry Optimus.