At Missouri State University, in Springfield, a pro-life group put up 4,000 crosses made of popsicle sticks to symbolize little graves of abortion victims. So pro-abortion students trampled them, destroying the display. When called on their vandalism, the pro-choicers said they were just exercising their freedom of speech! (That claim is in the video with the linked article.)
That is to say, I can deny your freedom of speech because of my freedom of speech.