> Do you classify all those who have an opposing viewpoint as being a
> "Troll" ?

Classify someone who writes posts only to stir up trouble as a troll.
Example: Posting "Perl sucks" to a Perl newsgroup. If someone actually
had a valid question, they could phrase it more diplomatically, such
as "Perl has room for improvement".

So lack of this diplomacy is a very clear indicator someone doesn't
actually care about the answer.

-- 
 Phlip