Loaded language is extremely common, and you doubtlessly use plenty of snarl words without even realizing it: http://rationalwiki.org/wiki/Snarl_word#Snarl_words

Though, much of a word's snarl comes from its tone and context. Where SJW is indeed a pejorative, it should not be construed as an intrinsic thought-terminating cliche. It's merely a shorthand to describe a certain flavor of people subscribing to academic ideologies that interpret the world as an identity struggle.