Blogger Matte Havoc (like his blog a lot, by the by) wrote a nice piece about not offending your readers in writing about films. Don't take my word for it, click on the link, already. Then read my response:
Wise words. Too often writers on the internet want so throw out their thoughts and opinions without regard to how their words will be interpreted. Putting oneself in the minds of readers is a way to avoid this. It's okay to anger, outrage and even offend but it should be in the cause of making a strong point. Anyway, it's far better to inform and inspire. That's hard to to do if you're essentially calling your readers stupid.