I really can't fathom this.
The OP states that the tweet was too scant on identifying details on any people for us to link his remarks to a racist sentiment. So I pull up his words verbatim, unedited. On a casual analysis, we both agree to whom the words refer. We all know he was talking about specific people WHO WERE BORN HERE and telling them to go back to their country. And you are still trying to make it sound like there's something about this basic exercise in reading comprehension that changes the meaning of the entire text.
Understand: it is on anyone still defending him to explain what complex nuance of language we're all missing! Not on us! This is a pretty simple analysis of his writing. The complicated Pepe Silvia weirdness is not required to show the racist connection: it's required to show how it's not racist!
So stop with the trite answers and either elaborate to the level that will be would make this clear, or just say "you know what, the OP was wrong".