what a load of nonsense, most international polls determine it to be one of the least xenophobic and most racially tolerant nations, variously coming in at anywhere from third to fifteenth.
Although if you're Idris Elba post fame you'll be fine .. just don't ask him what it was like growing up.
https://www.youtube.com/watch?v=i8dAdZGtkg8
https://www.theguardian.com/uk-news/2023/mar/21/metropolitan...
The ethnicities you listed experience racism and xenophobia across europe, the UK is not exceptional in this regard (the nationality perhaps a little more casual xenophobia than they do on the continent but then most brits are at least part Irish).
I'm not sure the guardian or a youtube video count as references, the WVS might be a better place to start but there is no shortage of empirical (albeit this is a socially scientific topic) sources.