This isn't a First Amendment issue, it's a cultural issue.
The PC Police are not taking our right to Free Speech away. They are, however, leveraging their freedom of speech to use our freedoms against us.
The effective results are similar in many ways, but this is about cultural intimidation and control, not the Constitution, not laws.
It's obviously against the spirit of Freedom of Speech, but their tactics are not unconstitutional in the strict sense.
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There are no 'PC police' because this isn't a First Amendment issue; and because this isn't a First Amendment issue no one is seeking to 'leverage' his freedom of speech to use your freedoms against you, the notion is delusional, paranoid idiocy, making no sense whatsoever.
Private citizens are free to gather and exhibit their ignorance and hate with impunity, and other private citizens are likewise free to express their opposition to your ignorance and hate, where such opposition does not manifest as your mythical 'PC police.'
You and others on the right can't have it both ways, you can't express your ignorance and hate while at the same time expect others to remain silent and not respond, that's not how a free and democratic society works, and you can't whine about your freedom of speech being 'violated' or whine about nonexistent 'PC police' when others express their views and opinions that conflict with yours.