> Whenever I look at the Reddit history of a person attacking immigration by bringing up housing, I almost invariably see comments full of racism, xenophobia, a hatred of non-European-origin people/cultures, etc.

I think it is unfair to make these kind of statements. You are essentially telling the parent poster that they are racist. Perhaps your experiences have created your own kind of biases and hatred.

I agree that often times people do use secondary arguments to guise what they really mean but I think the way through that is to either refute their arguments, not to suggest they are racist.