Contrary to media spin, Trump never said Hispanics, Mexicans or legal migrants are "rapists." Instead, he accused the Mexican government of deliberately repeating Castro's tactics in the Muriel boat lift -- sending many of its criminals to the United States, including rapists. The idea that a government would do this deliberately is not so foreign -- Castro bragged he did exactly that with the Muriel boat lift in 1980, boasting he "flushed the sewers of Cuba" onto the United States, emptying prisons and sending the criminally insane in a lift later made famous by the film Scarface. Estimates place around 179,000 such criminals as illegal entries into the United States in the last decade. This is an argument over properly controlling border access; it isn't, and wasn't, an argument over how many migrants should be let in, and was never an attempt to bash Hispanic people, Mexican people, or legal immigrants. Trump's immigrant wife, Melania (potentially America's first multi-multi-lingual First Lady), made this exact point in a recent televised interview.
The Hispanic GOP and Independent voters get this difference, even if the media doesn't. Indeed, for many Hispanic voters, particularly those that are 2nd generation or later (who often do not even speak Spanish nor follow Spanish television news) agree with many of Trump's position on immigration, as Pew research polls repeatedly reveal. That is why Trump crushed his two Hispanic opponents in Nevada, and continues to lead both of his Hispanic opponents in national GOP primary polls. It is also why Hispanic voters rate him as well or better than his GOP opponents on the issue of immigration.
Of course, it helps Trump that Mexico's notoriously corrupt former presidents keep taking the bait and putting Trump in the news, prominently complaining they "won't pay for no "f******" wall", with Vicente Fox the most recent to take the bait, after the Pope before him, and another ex-president before him. All this does is remind Trump's voters both how authentic he is (real cages are being rattled in foreign places of power), and highlight an issue his positions are intensely popular with in the GOP, with immigration the number one issue for Texas voters in that incipient election Cruz must win to stay alive. Once again, Trump stumps the critics and Vicente Fox.