You are quick to judge an MBA based on their education.
People are judged by their education all the time. Why should MBAs be exempt?
Though I do agree that the arbitrarily judging of someone based on what learning they have done in their life is ridiculous. Though I can't help but feel that even you have done the exact same judging: "Maybe if people working in startups weren't such elitists and thinking you don't need business skills to run a startup, you wouldn't have so many fail." Not having an MBA doesn't mean you do not have business skills.