Trump has explicitly said "tariffs are a tax on foreign countries", and "we're going to be taking in trillions of dollars from China by charging them tariffs". imho this is his farthest fetching lie, because he's talking about trillions of dollars, where we'd literally be taking in zero.
The closest I've heard anyone in the Media come to calling him out on this is when they say "Trump's tariffs hurt American consumers". Normally they just say "Trump's tariffs on <x country>" which they know will lead viewers to believe him.
This leaves many voters still believing that Trump is able to to charge taxes to China/Mexico/Canada. The fact that no one seems willing to just say "he's lying, that's not how tariffs work at all, we're not taking in ANY money from China", is a problem.
If you want to educate your friends a bit about this, and for American companies to not get taxed for no reason, point them to this Investopedia article explaining the basics of tariffs (see the part where it says "Tariffs are paid by domestic consumers and not the exporting country"), so that SOMEONE can start holding Trump accountable for his unchecked lies:
.