Their culture not being "Dalish" culture (which doesn't exist except as defined in relation to the old Dales and the "Elvhen" of Arlathan) but rather their idealisation of their former culture which they think they've rediscovered the broad contours of rather than misconstrued entirely. You can be in denial about it if you like.
Bolded: Oh please, who in Thedas doesn't idealize their former culture? What nation/religion/former empire doesn't look on their own history with rose-colored glasses?
The dwarves of Orzammar look fondly on the time when they were a vast underground empire with Deep Roads and Thaigs that spanned all of Thedas, and obsessively try to keep that old ideal alive by holding fast to ancient traditions even though they're no longer apply, and like to act like they're still proud, superior, powerful bigshots even though they're vastly outnumbered by the other races (1 dwarf for every 100 humans), suffer mass infertility, and have only two known city-kingdoms besieged by darkspawn.
Tevinter is not only no longer the vast empire that holds the whole known world in an iron grip, but they were the ones that screwed Thedas over as badly as it is now. (Bringing darkspawn and all, which was "not us" as Dorian says; killing Anstaste, which they figure was "just a mage" to make themselves feel less guilty, as Dorian says). But they still like to pretend that their loss of most territories in Thedas and their current deadlock with Qunari are just minor setbacks that will soon be overcome and they'll be as grand as they were before the Blights.
And need I go into the Chantry trying to act like non-magic, Maker-worshipping humans are always perfectly sweet, loving, accepting, and reasonable, and that all problems in the world are always the result of mages and elves and heathens, and conveniently censure positive mentions of mages and elves in Andrastian religion and history?
But yeah, sure. Only the Dalish idealize their past, spend lots of time trying to rediscover and reclaim their lost culture and/or former glory, and are the only ones who can sometimes act like obnoxious brats about it. (And of course all Dalish are obnoxious brats without exception. Opinions and attitudes about it don't vary from individual to individual, group to group, clan to clan within Dalish culture the way it does for individual dwarves or Tevinters or Andrastians. All Dalish have one big hive mind of obnoxious past-romantization and obsession.)