I wondered if this was the reason, it seemed likely to me.
I suspect that one thing that may come out of all of this is a greater awareness of economic class/education as an element with ability to integrate into western culture for some groups.
Where I live, (not UK) in the past most of the Asian people who have immigrated are well educated, and also typically more middle/upper class, and often from an urban center. My boss is like this, she's from quite a high class, well off Hindu family, and really has had zero issues coming to live in a western country. I suspect actually that in many ways it almost feels like a better fit overall to her than India, from the way she speaks about it, and I have talked to other people in a similar situation who have that kind of feeling - sometimes it is why they left.
More recently, this has changed a lot. It's not really due to refugees, who were always coming but were low in numbers - some of these people struggle to integrate but there tend to be supports for them. Rather, there has been a flood of people admitted as economic immigrants who come from completely different backgrounds. They have little education, tend to be rural, many have marginal English. They are typically going into jobs where the majority of people are from the same background, something like Burger King.
This group have had a much harder time integrating. The problems here don't so much seem to be anything like sexual assault, but there is sectarian violence, issues with workplace behaviour and inappropriate work practices, and also, issues with driving.
The progressive types deny these things, which we can all see happening, on the basis that the first group have always integrated very well. I don't think their discomfort is just about race, it's about the idea that "lower class" people are the problem, which also makes them very uncomfortable. Which I understand - frankly it doesn't sit well with my politics either, but it's what I see around me. And I am not willing to pretend something isn't so because it doesn't fit some political ideology no matter how sympathetic I find it.