In the Magic the Gathering lore, the elves on the plane of Lorwyn could be an example of a reflection of this. They are obsessed with beauty and perfection and absolutely xenophobic. https://gamelore.fandom.com/wiki/Lorwyn_Elf

Pratchet’s elves are like that, too - and actually is part of the reason tolkien originally tried to avoid the world elves - not because of pratchet but because that was what elves were in England.