But some commenters are saying it's photoshopped:
Did a protester show this sign or was it doctored?
Skeptics Stack Exchange is a question and answer site for scientific skepticism. It only takes a minute to sign up.Sign up to join this community
Based on the link offered by Avery the sign was in fact displayed at the protest, and other protestors acted pretty quickly to get the sign taken down.
The article mentions that some people drew a conclusion that it was pretty likely that the person holding the sign and the person who took the photograph worked together, either to discredit the protest or just to troll, but there is no proof of either version presented.