It's true though.
Literally every interaction I've had with Trump supporters is the same. It's anecdotal, sure, but I've dealt with many, my family is made up of many, and they all seem to be a carbon copy of one another.
They hate immigrants, full stop. They try to play coy by saying they love legal immigrants, but that facade falls apart when they try to interact with someone who can't speak English. I've seen it happen over and over.
People who immigrate to the United States should speak English. Why is this considered offensive?
Because you are forcefully tearing a culture away from people, which is no different than genocide. America is an enormous country, and we have plenty of room for people to self segregate into a group based on shared values including language. This is - or should be - the beauty of America. We need to prevent contamination of the pieces that make the whole and that includes many languages.
