That's a common attitude in my country too whenever an immigrant complains about anything. "If you don't like it, go back to where you came from". But in fact they do want to be there while at the same time not liking some parts of it. Just like everyone really.

I think locals should follow the same advice. Don't like political lobbying, high house prices, the president, etc? Move to Canada. I personally moved to a country that suited me better. Americans are very reluctant to emigrate for some reason though.