User blog comment:Zero62422002/Devil Fruit and Haki/@comment-3048801-20101010212001

Yes, haki can be uses to hurt paramecia type devil fruit users. Ex. When luffy would be hit by sentomaru and say " why does it hurt so much I'm made of rubber", sentomaru said " because of my haki abilities" so yes if you were to use haki against someone like buggy it would hurt him/ kill him