Just steal the big book of grudges for any setting involving dwarves, up to and including glorantha

My niece’s beard puts your grandfather’s to shame!

That's not even that harsh for dwarves. Gimli called the elves naked jawed ones when Aragorn told him he was being rude in Lothlorien.

The dwarf, explaining why (s)he’s racist against dwarfs: “They are small, stupid, smelly, greedy, too angry and prideful for their own good, and they have no concept of true individuality (and their players tend to be the least creative people at the table, at this point “the dwarf” is almost as generic as a human fighter), they all deserve to die, and if I had the time and power, I would kill every last one of them, ending with myself. … …TLDR? Fuck em, that’s why.”