Okay, but are Jewish people supposed to just accept that you're walking around calling for the mass murder of their communities?
Weimar Germany was a society that was governed on this principle of a "marketplace of ideas" where "unacceptable evil beliefs will naturally be rejected", so is the modern united states. You can see two pretty clear examples of how this does not work and just allows fascists to promote their view points.
Say in you're example you're not just some guy on the street corner. Say you're a media executive. Say you're a politician. Say you're a billionaire. Is it still permissible? Say you make a new political party called the "kill all the jews" party, and you make friends with all the major media executives to promote your views non-stop all day every day on the air. Is it still permissible? Say you buy out social media websites, and make it against the TOS for those websites to say anything denouncing of the "kill all the jews" party. Then you flood those websites with indoctrination material and fabricated news stories. Is it still permissible?
Hate speech can and should be faced with legal prosecution. You should face legal repercussions for calling for all Jewish people to be murdered. Freedom of speech should not protect violent bigotry. The goal of government should be to provide the greatest quality of life for all. That is incompatible with allowing people to spread violent hate speech and indotrinate others into violent bigotry. This mistake has been made time and again. Fascists are the ones who fight the absolute hardest for "freedom to say nazi shit". Because of course they want it to be legal for them to do that, they're nazis. Protecting them from legal consequences for being Nazis literally only benefits Nazis.
Fascist speech is not hard to point out. Advocating for the removal of the human rights of minority groups should result in legal punishment. Advocating for violence against minorities should result in legal punishment.
No one is born a Nazi. You should not be able to exist in society as a Nazi. You should face legal action for being a Nazi. We hung people at Nuremberg over this. We have already long since had established definitions of what inciting genocide is, of what spreading fascism is.