Don't forget that a huge part of Kurdish people are Sunni's as well and they are the ones who are fighting ISIS the most, it's good that you don't make assumptions.
I was talking about the Sunni Arabs. A majority of the Kurds are Sunni as well (with sizable minorities of Shias, Yazidis and Christians) but very few of them support the ISIS. On the other hand, ISIS enjoys a lot of support among the Sunni Arabs.