As an aside, I think they don't. While it's true that in the past, fantasy humans NPCs were described as regular humans in a fantasy settings, evolving social structures akin to the one we saw in real life, it's no longer the case. I have noticed that fantasy humans are much more morally advanced than real, current societies, let alone past ones.
1. they don't seem to have noticeable gender bias in professional fields, including ones where physical labor is expected and where we do have requirement in real life that, in effect if not in intent, limit gender parity;
2. they don't seem to have noticeable gender bias as a social construct (for example, in laws);
3. they are extremely cosmopolitan, to the point that each city, even smaller ones, is home to multiple species [in real life, the competing species of Neanderthal was dealt with, either by assimilation or extermination, and I am pretty sure the politicians who pertuate racist views wouldn't like elves or dwarves if they can't stand someone whose perceived skin color doesn't match their own];
4. there is very few mention of xenophobia, even when neighbouring countries are at wars at some point -- and with the size of minorities they hold with the great melting pot their city is, it's strange they never developped measures against other nationals like happened in real life and left marks in the population;
5. there is very few religious strife akin to what was observed in real life, even when pantheons are sometime actively at odds with each other. It's not inexistant, it's just very seldom and usually restricted to "we don't like followers of the god of murder here..."
6. there is few social oppression -- though it's the weakest example. Paizo's world Golarion never invented slavery ever, canonically, and where it's practiced in other worlds, it is never tolerated by neighbours. There is few evidence of extreme social unequalities in description -- it's the "happy past times" où il n'y aura point de laboureur en mon Royaume qui n'ait moyen d'avoir une poule dans son pot, to quote Henri IV. You do get raiders, but they are rarely forced to turn to crime by famine or being just mercenary soldiers cheated of their pay the legitimate government;
7. there is very few prejudice against magic users, even while there is a clear divine vs arcane magic divide...