It's a bit of an outlier situation, but without going into excessive detail it is a single online setting, where DMs move between players, and players move freely among one-another, as such a single agreed upon policy is required, which is currently that most traditional 'monsters' cannot enter civilised settlements, and interactions with traditional creatures (elves, dwarves, humans etc), if not hostile, should generally be conducted with animosity. Further to this certain races, such as drow, are almost entirely prohibited from being good aligned.
Hypothetically a DM, in accordance with existing rules, wouls feel compelled to intervene if they saw a budding romance between a drow and a human, or if they saw a goblin sitting down for dinner with a dwarf. This is all rather strictly enforced, and often also reflected in good vs evil traditional narratives and quests (and in NPC attitudes).
I admit when it comes to traditional tabletop I am far more likely to be playing WHFRP, where such issues rarely arise (it's hard to get cosy with a two-headed warrior of chaos with a bloody tentacle hanging from his chest).