"In my middle-class, largely white parish, on the periphery of the Washington, D.C., area, there is a new "hostility" to immigrants, even though these migrants have been here for years."

That's because the election of Donald Trump has signaled to a silent army of bigoted people harboring hateful feelings about a host of "others" that it's suddenly okay to express those feelings out loud. It isn't just Hispanic people who are targets - Muslims, Jews, LGTB people are all experiencing a rise in hate crimes since Trump's election.  Under Steve Bannon's alt-right influence, Trump subtly speaks in code to such people, e.g. his conspicuous non-mention of Jews in his statement marking International Holocaust Remembrance Day - the one where he personally nixed the State department's draft which included such mention. That's called a dog whistle, and his dogs heard it loud and clear as they tore down grave markers at Jewish cemeteries all over the country. His dogs continue to heed his call.