please consider what you are saying in a greater context for a moment. if people are allowed to get in other people's personal space and scream and even destroy their property, imagine a scenario like this:
black panther and the kkk choose to have a march on the same day in the same place, meeting half way. under the Mattmun12 Act Section 420 Subsection 69, it is acceptable for them to scream at eachother (fine on its own, but in eachother's FACES) and kick eachother's signs over. I'm pretty sure it would end in a very violent conflict and there wouldn't be free speech for very long.
don't get me wrong - I'm an anarchist - which is actually why I am opposed to this woman's behavior. because it violates this person's property (their body and their signs). let me put it this way, if I had a business in my ideal society, and this sort of thing was happening, I would ask this lady to leave and use force if absolutely necessary to remove her from the premises. violent and aggressive behavior is not okay to me. at your business you can have whatever rules you like, however I'm not sure how many people are going to want to frequent a place where protestors are constantly duking it out and going completely bonkers