I can understand culturally incompatible, but what on earth is "racially incompatible"?

> working the lowest paying and least consistent jobs, with little-to-no chance of fully integrating.

It depends who the immigrants are. If your immigration laws favour highly skilled immigrants that is not going to happen.

In the UK people who live in ethnically mixed areas tend to integrate. In fact, I think most people integrate but the minority who do not are just more noticeable and used politically (not by just one side either).