That is idiocy.
Sure, the majority of Hispanics will vote Democrat. No argument there. But the percentage of Hispanic votes is going to be somewhere between 20-35% for a Republican Presidential candidate, and 65%-80% for a Democrat. In a closely divided election, especially in key states like Colorado and Florida where Hispanic voters are a big part of the electorate, the difference between 20% and 35% for a Republican candidate may be the difference between winning and losing the election.
You saying that even 0% means that "Trump loses nothing" just confirms the stereotype of unthinking, emotional, etc. Trump supporters that your initial post attempted to refute.
Here's the Hispanic vote breakdown over the last eight election cycles. The Trump approach that "Hispanics will all vote Democrat and we lose nothing by alienating them" is patently false.
1980 Jimmy Carter, 56% Ronald Reagan, 35% +21
1984 Walter Mondale, 61% Ronald Reagan, 37% +24
1988 Michael Dukakis, 69% George H.W. Bush, 30% +39
1992 Bill Clinton, 61% George H.W. Bush, 25% +36
1996 Bill Clinton, 72% Bob Dole, 21% +51
2000 Al Gore, 62% George W. Bush, 35% +27
2004 John Kerry, 58% George W. Bush, 40% +18
2008 Barack Obama, 67% John McCain, 31% +36
2012 Barack Obama, 71% Mitt Romney, 27% +44
http://latinovotematters.org/stats/