As a foreigner i have not the same behavior from Kurds (Kurds in general are angels with strangers and fought each others like devils), but I have travelled in many places and heard often Kurds talking about other Kurds.
There is one thing I've heard from some N. Kurds. They complain that S. Kurds don't consider them as real Kurds because they don't speak Kurdish (only Turkish). They can't imagine that a Kurd can not speak Kurdish.
Concerning who fought the most or who suffered the most, I have also heard in HADEP HQ some N. Kurds saying "in Bashur, there was not such things as 5000 destroyed villages'. And they were surprised to learn that villages in Bashur had burnt 10 years before Dirty War in Turkey and that Anfal was worse. PKK propaganda forgot to teach them that history.
So there are many prejudices because of ignorance and closed borders, from all sides.
Now the new prosperity in S. Kurdistan could incite other Kurds to be jealous (especially PKK supporters) and call them capitalists, liberals, upstart, etc. And lazy : for W. and N. Kurds are working hard in KRG, while Bashuris want only to make business or being State Worker or Peshmergas.
But I have heard more negative opinions from Bashuris towards other Bashuris : for example, toward Behdinan people and Behdinî from Silêmanî people and the contrary also. And of course, politics do not soften their relations.
I have heard also some Kurdish muslims from Bashur having bad opinion about Yezidis religion, while some N. Kurds (especially Alevis) and Eastern Kurds (especially Yarsans) praise Yezidis as 'true Kurds'.
I have also heard in N. Kurdistan Dersimi Alevis prejudices against Shafei Kurds (Alevi fear of Islam).
In fact, 'Kurdish bashing' is a national sport

There is also a huge difference between Kurds from diaspora and Kurds who have stayed in Kurdistan.