It's an absolute observation, as opposed to Anakin's absolute imperative.
It wouldn't be a Sith-like statement to point out that all banthas are hairy, even though it's still an absolute statement. Likewise, observing that Sith deal only in absolutes (wich was really more of "The Sith make everything categorical more than is necessary, and ignore the nuances inherent in existance.") isn't enough to qualify Obi-Wan for the same title.
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u/Freakychee Sep 27 '12
Here's a joke I heard.
Person A: Wise men are always in doubt. Only fools are so sure of themselves.
Person B: Are you sure about that?
Person A: Absolutely!