"What else is anti-Mexican racism but part of the warp and woof of American life?"
Any examples? Whites are only about 65% of the population. How ingrained can it be. I'm not an anti-Mexican racist. Neither are my friends. In some southwest states they either are or about to become majorities. Check the latest UN report on Canadian racism and Islamophobia and see supporting material that indicates you should probably be concerned with your own country more than the U.S. in the matter.  

"What else is Sheriff Joe Arpaio but a classic case of law and order serving the cause of bigotry and racism? "
He's an ex-con guilty of a misdemeanor. 
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"What else are threats to Mexico and the slander of Mexicans?"
A wall to stem the flow of ten million of them because the Mexican govt. won't?
A description of criminals sneaking in?
 
These are  just  failed  excuses to unleash an unhinged rant against the U.S.
Red meat for the electorate.