There are genuine integration issues in the UK so the anti-migrant bloc do have some valid concerns. However, there will be a non-insignificant amount of racists among them.

Weirdly, the "skipping the queue" rhetoric even works with fellow migrants. I have a friend from Iran who I used to work with that moved to the UK ~3 years ago; he's way angrier about irregular channel crossings than the average Scottish person I know. I'd imagine spending a lot of money and years on a waiting list before being given a work visa was a grating experience though.