its racism if you now stereotype black people as rude or something like that. To notice a trend in your particular workplace? Just dont stop greeting certain people
Realize though that if some coworkers have diff cultures they may have different behaviors. I think this is what outsider meant. For example, in East Asian culture, looking an official or guard in the eye is not done. In english culture, it’d be considered rude. There are different behaviors even among different places you were raised. Consider the stereotypical NYer vs the typical out of towner. What would be common for one would be ‘quiet’ for another, etc. But i dont think i’ve said anything new here!