No, it does not make them acceptable. But guess what? If we agree on that, then, logically, we must also agree that neither does it make them unacceptable!
Free speech is there to allow ideas, any ideas, to be freely expressed, exchanged. Well, in theory. In practice, most people can't wrap their heads around this one. They are all for free speech, but with reservations, like only when acceptable ideas are put forward. Mainstream ideas. Ideas of benefit to the society. Sounds great! Except for two things: where exactly do you draw the line between what's acceptable and what's not? And who gets to decide that?
Well, if it's there to protect a minority, that means that racists and white supremacists can yell their ideals at the top of their lungs; make and publish objectionable content, videos, with no fear of persecution. Right? Or did you mean that it's there to protect only those minorities that
you approve of, Kate?
Actually, free speech is there to protect each and every one of us from oppression, persecution if we see the need to speak out against something. It's there to allow every one of us to articulate our views, ideals, fears.
Free speech is a choice a society makes, or a select few make for their society. It is not a law of nature. And you are wrong, Kate: a society can flourish pretty darn well without opposing views. Take China for example. It's complicated. But it works.
Like
@TheBaldOne has already asked, it depends on the scenario. Do you mean stopping someone for "driving while black"? Or expressing racist narrative, personal views, without the authority or intent to cause harm?
IMHO, a racist policeman is a problem. Not "acceptable", as he should not be allowed to wear any badge, giving him authority to persecute, terrorize colored people. A white supremacist, foaming at the mouth and cursing under his breath at the sight of colored people, but not willing or able to take it further - not a problem. Or "acceptable", using your inadequate terminology. Let him be. The price to pay for... freedom. His. Yours. Mine.