Sometimes that's the case. When I was in construction, one company I worked for hired all West Indians.
Another company I worked was more diverse, people still working there after a 15 years. Not 100% sure how it is over there now, but when I worked there, there wasn't any coloured people in high positions there, not that I really care. I did experience racism there too, and last I heard one of the racists got written up for racism, but that's all for sure cause he goes fishing with the big boss and do pinky swears and stuff.
There was a time my workload was more than I can handle, so the company hired one of those, what are they called, when they have people looking for jobs but the company that middle mans the laborers takes a cut ? Well it was one of those and the guy they sent me couldn't even begin to do simple tasks, like crimp a wire.
I took my time showing him how to do it, but he would just say "I know" then get upset at me when I try to show him yet again. An hour went by and he made literally 0 progress, so within the next hour his carpool came to get him.
His race and gender had nothing to do with his incompetence and I would have been more patient but I needed a worker for 1 day and he had to go.
Jews hire Jews, Blacks hire black, Asians hire Asians. There was this one Vietnamese restaurant I've been to a few times and they have white people on staff, and the owner is some white lady with a Romanian accent.
In general maybe, but not always.