Exactly. Employers will not hire white kids to do manual labor. Look in any Greek (or Thai) restaurant kitchen to name only two other ethnicities who also seem to shun the grunt work.
Remove the market in cheap labor (i.e., ask Mexicans to go home and wait in line to come back) and Americans will once again to the "work no one wants to do" if, in fact, they want to eat. I will gladly pay another 50 cents for a grilled cheese sandwich if the result is not 11 million Mexicans dependent on the American welfare system.