It's not hard to shift "anti-American" speech to mean "anti-ICE", anti-current-administration, etc.
If it is this tweet you are referring to, it's about _teaching_ hate, which is only a slight nuance and still a terrible point to make for a self-labeled "free speech absolutist"
> Teaching people to hate America fundamentally destroys patriotism and the desire to defend our country.
> Such teachings should be viewed as treason and those who do it imprisoned.