Black cowboys were banned from brothels, but were welcome in gambling halls and saloons that didn't feature any prostitutes (miscegenation was still taboo or illegal in most Western states). Generally, there was less racism in the West than in the South. Some Western states did not have any strictly laid out segregation laws in regards to public spaces/towns (though all of them had anti-miscegenation laws), however, it was common for saloons to turn away blacks (but not Hispanics) and for blacks to be socially discriminated against. Even though anti-black racism in the West was less overt, hostile and violent than the South or even the North, blacks in the West still faced social exclusion and discrimination. Nonetheless, ranchers, cowboys, miners, etc. tended to get along and work together regardless of race. People traveled to the West to start fresh and anew, to find gold, make a good living, etc. They didn't travel thousands of miles to start trouble at their newfound jobs.

Hispanics in the West were usually treated a lot better than blacks though. One thing to understand is that the cowboy/vaquero tradition has a direct lineage to Spanish ranching traditions, and as such many Mexican cowboys/vaqueros were of full Spanish ancestry (in other words; white, or white enough) and thus were able to fit in more with the white Anglo cowboys than the black cowboys. We don't really know how Mexicans cowboys of full indigenous descent were treated, but I have to assume they were treated less kindly than Mexicans of full Spanish descent.