Our "friends" and "allies" have been telling us to "F" ourselves for decades.
As to blowback? Two words: Pearl Harbor. Any economic blowback will be cast, in my eyes, as similar to Pearl Harbor (in an economic sense). You can bet that millions of Americans in flyover country will have a similar reaction. Middle Eastern oil states would rue the day they set this in motion.
Wait a second! Our country tells them they can't buys American assets, and then if they don't, we are going to claim that is some kind of SNEAK ATTACK on us?! What are you smoking?
Meanwhile back in the real world......