America has no right to the markets of sovereign nations. Blocking Facebook etc is a matter of national security. Europe should do it too.
That seems fairly 'self-evident'.
I wonder how the US would respond to some country on the other side of the world insisting the US buy that country's product, and even saw it as a 'hostile act' if the US just didn't want to do so. That would just be bullying, plain and simple. And it would be ridiculous. You see that, right, GP?
Every nation decides who has access to it's markets. China has denied access to a set of US companies in certain industries.
It is then only fair that the US match this denial of access, which is what a tariff is.