I think the OP is taking the wrong tack on this issue. Yes, I wish people who immigrate would make an effort to learn the language of the country to which they have moved. Not because it inconveniences me if they don’t - it doesn’t, and even if it did, other people aren’t obligated to make my life convenient - but because without English, they’ll miss most of the opportunities and advantages they presumably moved here to gain. Not speaking any English when you live in America is a good way to end up in low-paying, dead-end jobs; it’s a big step on the route to poverty and all the problems that go with it.
However, for folks who are mortally offended by people like this, rest assured that the problem is self-correcting. My 28-year-old sister-in-law immigrated here with her family 25 years ago. Her parents still speak absolutely no English, and have no intentions of learning any. As a result, they live in a dangerous part of town, work unpleasant jobs, and subsist well below the poverty line. But my s-i-l learned English despite her parents’ resistance to it, although she speaks with an accent; her siblings learned, too. Their children, American citizens by birth, speak unaccented, standard English (and Spanish). Problem solved in three generations.
My brother-in-law moved to this country when he married my sister. His spoken English is quite good, though his writing skills aren’t great. He works extremely hard on it, though, since he has a family to support and he knows he won’t be able to get ahead without English. My nephew, their son, speaks unaccented, standard English (and Turkish). Again, problem solved, but this time in two generations.
My point is, no matter how resistant to (or accepting of) English the original immigrants are, their children and grandchildren will want to speak English because they will want the advantages that come with fluency. And while the language problem is being solved, the immigrants work jobs most Americans would scorn to do.
What harm does any of this do to the rest of us?