You are missing the core argument of your interlocutor. From a purely utilitaristic standpoint, educating and correcting someone who seems to be in good faith but repeating propaganda or lacking knowledge is more effective that being an asshole (which BTW completely avoids the possibility of that person considering seriously what you are saying). So if you want to “shut it down”, your actions are ineffective or counterproductive.
You do you, of course, but nobody is asking to tolerate Nazis.
Run it with sudo in case you don’t see the process name with the above command.
sudo ss -patln | grep 443