Receiving a B in physics--even at a CC--isn't the end of the world, especially if you plan to take other advanced science courses at your normal university. Rocking the Physical Sciences section of the MCAT wouldn't hurt either
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However, if you absolutely can't stand the professor, why not switch sections? I've always gone for the hellish time over the hellish teacher, but that's just a personal preference. If you're thinking a C or below is very real possibility though, I'm sure a W would be preferable to a poor grade-provided, of course, that you don't have a string of withdraws already.
Yet as a disclaimer, these are just the musings of another applicant for the 07/08 cycle. I'd take what I and others say into consideration, but don't consider it gospel. Good luck; it sounds like you might need it.