Being a jerk != being successful!
Having a great product eye and good design sense are excellent traits to emulate. Having "strong opinions, loosely held" is another great trait to emulate. Being honest and direct when something isn't good is also a great trait to emulate. Demanding people do their best is another great trait to emulate.
Being a jerk (at least under certain circumstances) is orthogonal and unrelated.
Unfortunately far too many people mistake correlation for causation and think being a demanding jerk is the key to success. First: you are no Steve Jobs. Second: that isn't what made him successful.
(Being direct and brutally honest can also come off as being a jerk. We have lots of pressure to be positive / supportive and avoid social conflict. It is always easier to say "that's great" or "nice job" than give actual constructive feedback, especially when the recipients are likely to be defensive about it. It is critical for startups to avoid this and be brutally honest with themselves about the product!)