Depending on your definition of 'okay', it's fine for some people to start on a 600. For example, I have a friend who started on a zx6r and he's still alive, but as far as the development of riding skills goes, it may have been better had he started on a 250. Also, he's lowsided already.
Be honest with yourself and weigh the risks. Most of the people here will recommend that you start on a 250, but if the higher chance of making a fatal mistake isn't something that bothers you (or your loved ones), then starting on a 600 is fine. Just be ready to deal with any consequences that result from said decision.
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