Why don’t Americans like immigrants?

From being an immigrant myself into America I can safely say that I was not a victim of any kind of discrimination from being an immigrant, this is probably due to me being from Europe and my parents having a good job. But I’ve seen a lot of racial discrimination from immigrants coming from poorer countries like Mexico, African countries, Columbia etc. I’ve especially seen and heard the line “speak English” and “go back to your country” many many times. I don’t understand this hostility considering immigrants make the economy better, they work high rate jobs that are important to the economy, they most of the time contribute to new technology that advances us and they work high tech jobs. I don’t understand the hostility in America to be honest, if we all just accepted each other and stopped looking at people from a class and race standpoint then America would be a much better place.
Why don’t Americans like immigrants?
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