Could you clarify your question?

Most Kurds are Muslims, so unless you're suggesting the Kurds hate themselves...?

There are numerous personalities in Islamic history who were Kurds. Saladin is no doubt the most famous example. Other examples include the historian 'Ali ibn al-Athir (d. 1233), the historian Shams al-Din ibn Khallikan (d. 1282), the Ottoman scholar Idris Bitlisi (d. 1520), the writer Said Nursi (d. 1960), and the Ottoman preacher Vani Mehmed Efendi (d. 1685), one of the men behind the Siege of Vienna in 1683. We are unsure of the ethnic origins of Taqi al-Din Ibn Taymiyya (d. 1328), who may or may not have been a Kurd.

One can hardly call anti-Kurdish sentiment in the Muslim world "historical." Indeed, anti-Kurdish sentiment is not really a Muslim problem, especially since outside the Middle East most Muslims probably don't know much about Kurds at all. Rather, anti-Kurdish racism is directly related to nationalism. One finds racism against Kurds in countries like Turkey and Arab Iraq and Syria, where non-Kurds feel that Kurdish nationalism is a threat to their nation-state's territorial integrity; there is not really any anti-Kurdish sentiment in countries like Pakistan, Somalia, or Uzbekistan.

Your statement about Saladin's apparent tolerance of religious minorities would require a long discussion, but I'll give my two cents. The state Saladin founded (the Ayyubid Sultanate) was not any more tolerant or intolerant than other Islamic states that existed historically. The Umayyad and Abbasid Caliphates, Ottoman Empire, Samanid Emirate, Mamluk Sultanate, and other Islamic states allowed religious minorities to practice their religions while applying (discriminatory) laws such as a tax called jizya. I don't really see any evidence that the Ayyubid Sultanate was particularly tolerant, even for their time. They applied laws in the books that were also applied by other historical Islamic states.