Things are a little different in the open source world. Open source contributors are passionate—they often give things their all and as such usually have their personalities ingrained in what the do. This happens in the outside world too, but there's a tendency for contributors to be more passionate about something they're doing in their hard-earned free time.
Working for an open source company adds its own twist to the mix: Trying to balance out the drive to do what management has asked, with the direction a project is heading. This can be a challenging environment, especially if the company is acting as a contributor to the project and not necessarily the owner.