What a strange claim. "Looking back", he can't help but feel discriminated against due to his height. It couldn't possibly be because of his "no formal eduction, no experience with any big clients", could it?
If you have demonstrably great work, what does formal education do for you that will affect your work for some company? Similarly, if this guy isn't the one landing the client or dealing directly with them on a regular basis, how can the pixels possibly care about for whom they are assembled? I read these parts of his anecdotes as excuses concocted only after an in-person meeting.
Raw talent is just one factor in finding good employees. A successful company requires well-rounded individuals, or a strong structure if you're going to successfully incorporate poorly-rounded individuals. Everyone in a company has to work together in a team in some fashion.