@QueenCamilla is raising a very genuine issue and it's why imo unlimited mass immigration is a very right-wing policy. I mentioned this earlier in the thread in fact.
Ignoring the issues doesn't help. We need calm adult discussions about mass immigration (without knee-jerk reactions, insults, or hostility towards immigrants) and the impact on people and communities especially disadvantaged ones.
Acknowledge that concerns about impact, especially on less advantaged people and communities (including immigrants), are very different to being 'anti all immigrants' or being anti 'people not like me'.
Relevant I think are the numerous threads on MN on regional within-UK migration. Same issues and concerns are seen about fellow British people.
There are a minority of genuine racist and or anti-incomer bigots unfortunately, but for the majority of people their concerns are about genuine issues of housing and job pressures and other impacts. As QueenCamilla points out failing to acknowledge any issues is unfair on immigrants as much as on 'born and bred' Brits. It's hardly 'Left' or 'progressive' to have slum landlords exploiting disadvantaged people, migrants and 'born and bred' British alike.
With what QueenCamilla and Devonbabs describe regarding integration. If some groups or individuals are struggling to integrate, surely it's better and kinder for everyone in the community, new and old, to look for ways to help with integration instead of denying there's an issue?