Really?
Given we don't how many Klans exist, How many they number and many other factors, we may have seen a good deal of them, What then? You can argue the fallacy trope all you like, It ultimately doesn't matter given that we don't have the numbers but we do that have the lore which matters a great deal more.
So you really think there are only 2-3 clans in Thedas?
Add in that culture as wcholcombe exists in concert with them existing outside of Humanity, not alongside it and their interactions to date prove to be very telling.
You misspelled "Clan."
Unless you truly, seriously believe there are only 3-4 Dalish Clans in all of Thedas, the 2-3 we've seen so far are NOT a "numeral majority" in any sense of the word. Even if there were only 10 Dalish Clans in all of Thedas (which I seriously doubt), the 2-3 we've seen are not a numeral majority. You are using a numeral minority to judge the majority or entirety of a group, based on a sample that is too small to represent everyone.
It's a fallacy. Your logic is both prejudiced and fallacious.
Namely as long as they cling to the belief that they were once Immortal and Humanity cost them that, there can be no true permanent interaction between them and Humanity, at least not civilly.
And as long as Andrastian humans believe that Andrastianism is the One True Religion ("There is One Light, One Word, One God"), that anyone that doesn't believe in the Maker and The Chant of Light are evil heathens and savages, that the Maker left the world because of humanity's own sin in trespassing on His Golden City and betraying/killing His bride, and that the Maker will only return when the Chant of Light is "sung on all four corners of the earth," then there will never be true peaceful or civil interactions between them and the elves. If humans' good will toward others depends on others being Andrastians like them, then they will never truly tolerate or accept people trying to practice their own culture and religion. The elves have their own culture and religion that they want to practice without humans breathing down their necks, telling them they need to give up to be like them.
What? Not ALL humans are bigoted, intolerant, proselytizing fanatics that believe everyone has to follow the Chant to the letter like them? Not ALL humans spit hate at every Chasind, Dalish, or Orzammar dwarf they see because they don't follow the Chant of Light like them? Some or many Andrastian humans are just as friendly, engaging, and obliging toward non-Andrastians and non-humans even though the Andrastian religion's fundamental belief is "Human Andrastian > non-Andrastian"?
Then why on earth do humans' fundamentally "intolerant" culture ("You have to be like us OR make room when we force our way through because our Chant of Light being sung 'on all four corners of the earth' comes before your right to keep your own traditions and beliefs") not automatically make them all intolerant jerkasses, but the Dalish's basic belief that they want to regain their culture, religion and possible immortality without constantly being in the company of humans (who history has shown will not respect their privacy, religion, or way of life) automatically makes them all intolerant jerkasses that deserve what they get?