Happens every year. I've seen many riders lash out at stupid fans who are in the way. And fans have taken many riders down. Guys have gotten their handlebars caught in purses. One sprinter was slashed on the arm by a woman holding a sign years ago. A rider tacoed his wheel on a dog that crossed in front of him.

Search YouTube for the clip of Nibali, I think it was, knocking a woman over taking a selfie last year or the year before. No one felt badly for her!