Which civil rights? Whose? Is the claim that you have to shut people up in order to protect people's feelings, or is it that you have to protect the dim witted from dangerous ideas? Is it that people are herd animals who will inevitable follow whoever signals the most followers, so we need to prevent bad people from signalling? This particular case isn't one of bot spam, its a real person making real(ly dumb) statements.
Facebook's obsession with free speech is one of the only good things about the company. I said it in another thread: they should be boycotted, but not for this.
edit: sorry for the formatting, its just cutting my words in half if they are at the end of a line for some reason