The funniest thing to me is like yeah there's classism and racism (though I would argue it's more classism than racism) within the demons of the Devildom but it seems to be mostly based on "how able am i to kick your ass" hence the more magically and physically powerful demons end up in higher positions (and this makes much more sense when you learn that the Devildom had no laws until Diavolo's grandfather so it would have very literally been "survival of the fittest")
However if you take out the magical/physical strength factor: demons, as we see in the game, come in all shapes and sizes and from different cultures and are never treated differently based on that eg: the ant sized demons and the nightlantern people
So all I can imagine is demons being like:
Humans discriminate each other based on *rapidly check notes* skin...colour????? and where you come from and what you believe in???? Not on who can knock out the most teeth????????????????
Just absolutely bamboozled by it
Also about knowing what the human world is like, we find out in S3 that at least Mammon has a pretty good idea what the human world is like because of how often he visits it due to running errands for Lucifer, paying debts to the witches, visiting his kid - to the point that he blends in pretty easily unlike some people *cough*Satan*cough*
It's not human world racism but Nightbringer shows that the 7 brothers have a pretty good idea of what racism actually is, given the way they're initially treated by civilians of the Devildom (eg: how they're kicked out of shops) and how they still seem to be treated by the nobility. "Fallen Angel" also seems to be a slur or something similar which I will never get over
We also get to see a lot of racism from the angels towards the demons in S1-4 and vice versa in Nightbringer. Also, of course, keep in mind that the Devildom and the Celestial Realm aren't actually Hell and Heaven and it's not a story of Evil vs. Good, so like Mammon and MC say in Nightbringer there's no actual difference between being an angel or a demon other than living in a strict society vs living in a free/chaotic society
And going on a tangent here because this interests me:
About the Sins vs Nobility and how they treat lesser demons
We never see the Sins, or Diavolo for that matter, treating lesser demons badly despite being some of the most high ranking demons in the realm:
• With Diavolo of course it'd go against his personality to treat them differently
• The second Dames event shows that the Sins seem to have more of a problem with the nobility than anything else
• Which is supported by how against them the nobility are in Nightbringer
• Through Mephisto, in the current time, we see that though this attitude has mellowed out it hasn't completely left
• Despite the Sins and the Nobility generally being in a similar station of power there's a huge difference between their attitudes towards the lesser demons
• Mephisto for instance is so rich that not only is Belphie shocked by it but Mephisto has also never eaten a burger before which is insane
• Meanwhile, all the Sins have frequently held working class jobs, either because they're genuinely trying to earn some money or because they're covering a shift for a friend
• In Nightbringer, despite thinking MC is a lesser demon they're never really treated differently by the Sins. If they are ordered around (which again is very rarely) it's because they're literally working for the Sins and if MC doesn't want to do what they're ordered to they just... don't and they face no consequences. The Sins also acknowledge and respect MC's competence and opinion.
• Meanwhile, in Nightrbringer we see Mephisto (who is literally and narratively a representative of the House of Lords and Nobility) thinking MC's a lesser demon; ignore MC, dismiss their opinion and expect to be shown out of RAD by them without even being asked which heavily implies that due to their perceived difference in position this is MC's duty even if they don't work for Mephisto/Diavolo/RAD
• The Sins seem to see more of themselves in the lesser demons than in the Nobility which makes sense when you consider how they came to the Devildom with nothing, had to rely on Diavolo to survive, still live in what is essentially a RAD dormitory and have to actually work and earn money to buy the things they want
• Whereas, the Nobility are probably demons who had to fight their way to the top long before Diavolo's grandfather introduced the laws and then spent generations at the top, amassing wealth and getting more than used to their set status quo
