That is the problem with these video's without really seeing how the whole thing came down it is hard to judge. If he broke no law he had the right to his sign and his speech. But you are right, if that is private property then no he doesn't .. But in order for free speech to remain free it has to extend to everyone, even those we find odorous.

Remember the case where the Nazi's wanted to march in Skokie Ill. They won the right to do so. I don't think they ever did march .. Only if America protects everyone's speech can we insure that our children and grand children live in a free nation.