Let's not forget the humans (and the Klingon and the Bajoran) on the DS9 Sr. staff all think they are superior to the Ferengis. The only humanoid among the Sr. staff on DS9 that doesn't feel that way and treats the Ferengis as equal is the Trill (Dax).
Huh? The staff all treated Nog with respect and Rom too after a while? Or maybe it's a case of Nog and Rom being assimilated Federation values?
Quark once helped someone nearly kill Dax!
I dont see any of the senior staff thinking they're above all Ferengi. Might be one or two examples.