Vox Day had a pretty good interview about this on the Tom Woods podcast. He said that the reason why the right mocking the left with the term "SJW" gets the liberals riled up is because they take social justice seriously. They view themselves in a self righteous light.
So when you mock their own terms and social causes they go bananas over it. It's all about ownership over language and terms. If you take something they hold sacred and make it a term of derision and mockery then that's what pisses them off the most.
Stuff that makes light of their life experiences always pisses them off too. They try to hold onto victim complexes but when you just call them out on being bored suburban kids they go into fits.
So when you mock their own terms and social causes they go bananas over it. It's all about ownership over language and terms. If you take something they hold sacred and make it a term of derision and mockery then that's what pisses them off the most.
Stuff that makes light of their life experiences always pisses them off too. They try to hold onto victim complexes but when you just call them out on being bored suburban kids they go into fits.