The main problem is that some, sometimes most, of immigrants don’t want to assimilate. They are creating ghettos, don’t respect local laws.
Generalisations like this are the very reason it’s a polarising issue. Opinions like yours generally derive from “observation” and “gut feeling”. Which by definition is completely anecdotal and harmful when it begins to be applied to millions of people all at once.
Betsy from insert town here sees an immigrant couple down the street in her home-town keeping to themselves and not really wanting to take part in the community. She’s talking on the phone to nosy-nessie the town busybody who says “oh…you know…my aunt said the same thing about her insert culture neighbours.” And then all of a sudden, that’s just “how those people are”…all of them…everywhere.
Maybe this couple is just a little embarrassed about their english skills and want to strengthen them more before going into public everywhere, which comes across as shy. Maybe they’re just private…who knows. But suddenly…“it’s just how (those people) are”, becomes the anecdotal “truth”.
It’s wrong, it’s dangerous, and the fact that you don’t even grasp the irony of your own comment is telling in a lot of ways.