It's not just him. I keep reading and hearing stuff about her, how terrible she is, how hypocritical and awful, and there's never any specifics. The only specific I ever hear is the Cherokee story, and it makes no sense that this story would cause the amount of scorn she gets.
The Chamber of Commerce declared Warren an "enemy of free enterprise", but they haven't offered specifics either. And it's especially ironic since the Chamber was pretty grateful for TARP, and she was one of the main people in charge of that program. If she truly hates the big banks, why would she want to rescue them?