So we have stuff like this that can completely fly under the radar of outsiders, since the undesirable discrimination, or even whether someone is in a favored or disfavored group, may not be easily noticeable by outsiders:
But in situations like workplaces, such undesirable discrimination can have a negative effect on work interactions, as well as potentially leading to legal problems. While employers, colleges, etc. may be adding rules against such, it can be difficult to enforce the rules if those who would enforce the rules have difficulty recognizing when the undesirable discrimination occurs.
Edited. It is unobvious why this post was flagged.