Dude only argue with a leftist if you're doing so to test an idea. I use them to battle test most of my theories and beliefs. If they can't get pass those drooling idiots childish rebuttals the idea won't stand up to any real criticism.

I would never waste my time trying to convert them or convince them of how stupid their ideology is. They don't care and usually they are doing it out of rebellion anyways so you telling them not to believe just makes them want to more.

There's also the strong possibility that you're just talking to a bot or a shill and you will quite literally never convince them to change their mind.