> but you can't grab a megaphone, head down to the mall, and encourage other people to hate the same people that you do

Your example is a misdirection. What you describe is being a public nuisance in a public area, not free speech. I don't want to be subjected to nasty, racist rhetoric in a public space, just as I don't want to be harangued to repent of my sins and "Let Jesus into my life" in the same place. But I support the right of people to be able to express these views in a published form, or in closed spaces such as on a talking tour or in a church. In both cases audiences are seeking to be exposed to these views and are actively going to a place to find them, not having them pushed on them as they go about their ordinary lives.