I think it's a bit of spin to say he meant counties. Again, though I don't like the way the tweet in the OP was presented, and am still a staunch believer in a dignified presidency, I was wrong again on how that tweet progressed.
Between Pressley just coming out and saying the racist remarks about (paraphrasing) "people of the same color, other than white, all need to think the same and act the same", and Omar double dog doubling down on her hate and anti-semitism, they completely fell into essentially a trap that in the end is just making Trump look like the curmudgeonly Uncle that spouts off at Thanksgiving dinner, while they look like racists, bigots, commies, and traitors. He said something crass that brought out the hate in the squad, that is now eclipsing what he said.
Again, while I don't like the tone of his OP tweet (If he had just said, "If you hate America, move somewhere else" I would have been fine with it), that doesn't mean I don't like him saying things straight. I have no problems with the other tweet I posted as "much better". Unapologetically calling out that crap is better than dancing around it and letting them get away with it as "victims".