You're right mate, it shouldn't come into it but, in real life, it does.
In this country, you only have to look at the demographics in certain industries to come to the same conclusion.
When I was 18 I worked 9hr shifts in a freezer warehouse at -35 degrees.
It was all white staff in there - a few black lads had a go but, just couldn't stick it.
The warehouse next door was for jet washing and stacking cages - it was staffed almost exclusively by blacks (because it was warmer and the work was easier).
How many black, oriental, Asian blokes do you see doing