I’m not giving my side of the argument, because I’m not engaging with the argument. I’m talking about cultural values, not legal definitions of free speech.

Sure. But it's still one of many branches in this same exact conversation tree. ("What happened to free speech culture?" "Free speech doesn't mean you can say whatever you want without consequence, and these are private companies" "But Facebook and Twitter are really more like public squares" etc. etc. etc.)

If you accept that you'd never let some soapbox rando yell politics in your face just for the principle of the matter, the discussion will inevitably boil down to the role social media plays in society.