There are lots of cranks on the internet. Mitt romney received literally thousands of racist rants and threats of violence from Black people before the election, people who could just as easily be characterized as RABID angry progressives. So if this is your criteria then I'd agree that the rhetoric gets out of hand ON BOTH SIDES.
Now if you want to actually discuss policy I think you'd find that there are legitimate arguments to be made that illegal immigration from Mexico has had definite negative consequences. And let's face it, it's not like there aren't a lot of Mexicans that have crossed the border but aren't really interested in becoming Americans. Groups like La Raza are just as damaging to the debate as angry white people.