It has to be a consistent, full-out assault or it's not nearly as effective. They want everyone, everywhere, at every moment to feel they'd better watch what they say or else.
I'd say we're damn near there.
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If the left is worried about bias, they better send some teams out immediately to the DNC since they have shown clear bias against Sanders. Then ABC, CBS, NBC, CNN and MSNBC need to have a visit for their clear favoritism of liberals. They all stick together and bash Republicans, then want FOX off the air because one news outlet dares to speak up for conservatives.
Notice that only certain people get called on things. No white would be taken seriously if they complained that they were being called 'honky.' No student would get very far with a complaint that someone wrote Hillary on the sidewalk. The left could use enamel paint on the front of the building and they'd still claim freedom of speech.
White students with dreadlocks get beat up and told not to commit the crime of cultural appropriation. Beyoncé dyes her hair blond and no one dare say a word.
The only bias they care about is that which goes against the moronic political correctness.