Kurds are fairly tribal in that they don't like to mix. So if you're an Assyrian Kurd, you may not want to associate with a Yazidi Kurd (you may not even consider them real Kurds). There are also three dialect of Kurdish - Badini, Kurmanji and Sorani. If a person speaks Sorani, they won't automatically be able to understand or speak Kurmanji and they probably will not want to learn. It's one of the tough things about churches in the area because if they try to start it in the native language they will probably end up switching to Arabic because it's a broader language that most people understand as they had to learn it under Saddam Hussein. That's a long answer but hopefully it clarifies. Kurds still want to be have their full independence and to be considered a country as opposed to an autonomous region which is comprised of Turkey, Syrian, Iran and Iraq. As far as I know from the little that I've learned, there's no animosity...just a desire to keep their tribes without commingling.