You seriously need to bring this up with the professor. An email might actually be better than doing it in person.

Why? If you send an email, the communication is documented. The professor isn't necessarily going to handle this well; being in a position of power doesn't mean you use that power wisely. So if this jerk ends up messing up your project you have communication, in writing, that you'd tried to discuss this.

You should still talk to the prof in person, but make sure there's an email about your concerns.