The problem is stirring up hatrid against one or more defined demographics to make political advantage. It is a core component of fascism's path to power.
Amazing that this was said without any irony at all.
I did not conflate the two. The wording in the OP definitely suggests a concern about hating as opposed to being against. It is possible to be against something without being inflamed or more angry.
We should also be cognisant of where any anger is directed - is it to the policy makers in government, or to the immigrants themselves?