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What OTHER language would you like to communicate in? ....
Depends on who I am communicating with, and certainly none of your business. Now, how about you make that the last time you address me personally instead of the thread topic? Hmm?
"Mexicans" (FYI, they are not some cookie-cutter army of clones, and not every immigrant in the US is Mexican [I can't believe it is necessary to point this out AGAIN]) are assimilating and learning English as generations of immigrants before did.
If two or more people in the US choose to communicate with each other in whatever language they want, it is none of the business of anyone else. A private communication is not "disrespectful" to a would-be eaves-dropper. Presuming to dictate how other people communicate with each other most certainly is.