Utter tosh of the worst kind because it flies in the face of what anyone see`s and does every day, why do you buy from or sell to anyone ?, because you like them ?, maybe you admire their political believes ?, or could it be as simple as they are buying or selling something you want/need at a price acceptable to you.
The whole nonsense is assuming that all 27 countries are equal when they clearly are not, there are member states that will go to the wall without our trade and they and you both know it, then they have to be bailed out (Like Greece?) or more likely can not stump up the membership fee`s so the other members are also in shit street.
However if the EU does get away with acting the dictator and all the member states comply there is a big wide world out there who will be happy to gain markets in the fifth largest economy in the world, we are not on the shitty end of the stick, the EU is.