I would assume it means tolerating them as giving them the same platforms and resources as anyone else. So news shows inviting Nazis for them to explain their v

I would assume it means tolerating them as giving them the same platforms and resources as anyone else. So news shows inviting Nazis for them to explain their views, companies treating Nazi symbols the same way as all other symbols etc. You can still have free speech in the constitution while society as a whole is intolerant towards those ideas.