afaik you cant tariff single EU country without enacting the tariffs on the whole EEA, not sure if US would go in that direction...

I believe he could; that's why tariffman was considering taxing french wine. https://www.politico.eu/article/trump-says-tariffs-on-french...

yes, but the response to those tariffs would be similar tariffs from whole of EAA, no?

Unless there's a trade treaty stating this, then the US is not beholden to EU rules. Even if there is a treaty, they generally all give the US the ability to ignore their provisions if it is an issue of national security, and it's under that claim that the current administration has issued tariffs already.

Yeah, what I meant is that EU would respond as single economic block...

How would that work?

Say the US applies a tariff on wine imports from France. What happens next? Does every other EU member in solidarity start self-applying the same tariff to their wines and sending that over to the US tax service?

No, I think the EU - EAA would respond by enacting similarly sized tariffs on US products.

It should be clear by now that reason has left the building.