A lot of people on the forums talk about templars as if they're boogeymen, who wait in the woods until the dead of night and swoop in, snatching up good little mage boys and girls from their families and fly off to cook them in a pot.
Also a lot of people call them rapists and sadists because of what a few deviant say, and then get mad when people refer to mages as walking time bombs or power hungry, and cry that you can't judge everyone based on the actions of a few.
Also a lot of people like to mock the templars are being incompetent or generally dim witted, from their fashion sense to their lack of magic. Can't really tell if that counts as dehumanizing or not, but I do know I get a laugh out of those posts one way or another.