I wouldn't necessarily say that promises of "We welcome fresh and new perspectives...isn't afraid to make comments..." is a warning sign. As a founder I truly try to listen to our employee's thought and ideas and if they make sense, we implement them. In fact we just started an internship program where the interns pitch us a feature/idea for our site and if we approve they implement that live on our site.
In the end it's just like anything in this world, there are alot of talkers, that say the right things but don't mean them, and then there are doers, people that follow through on their words with actions. The difficulty is differentiating between the 2...