I'm mostly waffling but this chimed with me from the other side, it's funny because most of the prejudice against afro Caribbean/black people that I've encountered has come from recently arrived Arab, south Asian and central european people. It is a shitty situation.

I've spoken briefly to a black friend of mine about this. His family are from Barbados and as our conversation went on, he suddenly mentioned how there's always been a sort of ingrained dislike of Asians in their family. He couldn't explain it, but he admitted that it has made him look differently at people of Asian descent.

I feel like the chauvanism is mostly mutual, but as somebody who is partly of Afro Caribbean descent (but who has been mistaken for all sorts of ethnicities etc) this is somewhat true in my experience of a lot of people, especially the older generation. I only have a sketchy knowledge of the situation in the different Caribbean islands and it can be very different, but I think the ethnic prejudice of quite a few afro Caribbeans is routed in a historical (I am actually not sure if it still exists but doubt it) sort of class dislike and mediated by ingroup/outgroup relationships and sometimes mutual chauvinism on the islands where the Asian population is the only other major ethnic group and sometimes has a somewhat similar role to Armenians in pre ww1 Turkey, they are often poor but there is a substantial middle class group.

To varying extents, both groups have an endogamous core to them centred around religion and cultural mores that often turns into chauvinism and comes into conflict. This has some carry over to England imo especially the older generation like I said, but it's carried on in some places by young people, there have been violence in Birmingham that are routed n in a mixture of class, cultural and ingrioup/outgroup relationships in a similar way to the violence in Bradford between White and Asian communities. But this says nothing fundamental about relationships between the two groups.

In my experience it basically depends on where you live and who the ingroup/outgroup relationship is between, I think in parts of Brixton it is between South asian and/or Muslim groups and Afro Caribbean groups and that is likely to produce the kinds of unpleasantness you describe, but elsewhere, where there isn't that relationship, things are different and people get on together.

I think what you seem to have experienced is the shitty hoodlum version of this relationship, that is often heightened in poorer parts of cities where ingroup/outgroup tensions and competition are exacerbated by poverty.