Identity Quotes in Dark Places

Different people see different aspects of Ben's identity. Why does he show this side of himself to his female fans, rather than to Libby?

Yikes. This clumsy insult comes courtesy of Libby's dad after she refuses to give him money. Ben also tells Libby that she reminds him of their mother, but in a much more complimentary fashion.

We're not sure if Libby really sees Runner as "Dad" here or if this is just a slip of the tongue. We don't understand why she would have any affection toward him, considering what he called her a couple of chapters ago.