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1.
Someone who labels anyone and anything in an effort to avoid

explaining the reasoning* behind a conclusion they have espoused.

* because there is none
Doug is such a labelist! If someone disagrees with him he just calls them a "crazy liberal"!
by Dr. IV January 01, 2013
 
2.
An asshole who continuously labels people, regardless of if they actually are that label or not.
"You don't believe in god, therefore you're an atheist"

"Not true, you are a Labelist".
by Not a Labelist December 23, 2011