You get micro-managing of daily interactions down to criticism of language, when you give people that power.
And to make it worse, political correctness gives the veto power to the most emotional person, often delusional or irrational. You have to be silent because X says you're word choice or stated views might be offensive to group C. You aren't allowed to read that book in public, wear that T-shirt, because we say so. And if you don't fall into line, they throw a tantrum. And if that doesn't work, the illiberal liberal mob comes out to shout you down, threaten your safety because your contrary views threaten their world view and try to drive you out of your job, your home, your social life.