>>96111733
high elves live in cities, wood elves live in rural places, dark elves probably also live in cities both above and below ground.
Would make sense for high elves and dark elves to be in conflict since they live in the same places.

I still think they should generally be at least a bit reserved towards each other since they might view each other as equals since they're all elves, but since they have different core values they might look down on the other types for getting it all wrong. Expand this to more uncommon extremes at either end with some groups being in open conflict and some being pretty united.
Neat thing about values and culture is that it doesn't have to change with technology. Holy wars can be fought with assault rifles and tanks just as well as swords and lances