That tweet is priceless. I've never seen a politician flip the bird so publicly to his critics. And the writer is correct, this is directed at Trump's fans, not "wetback" Mexicans (as opposed to legal Mexican immigrants, of course).
The extreme left wing has been protected by political correctness for so long, they really are stunned when Donald pisses all over it like this. He's not afraid of them, and he's pointing out to us that we shouldn't be either.
Exactly, it was a great ‘screw you’ to people who won’t even know they’re the butt of the joke.