Harmful human cultural practices are classified as being parasites, competitors or amensalists in memetics. However there are hardly any competitors or amensalists hosted by humans - since most cultural practices need to benefit from their hosts by draining them of resources in order to exist - except for a few memetic hitchhikers.

I think if you deny deleterious cultural practices can usefully be classified as a form of parasitism then you must do so on the basis of some kind of criticism of the memetic framework. As far as I know the technical criticisms of memetics are all bogus. So: the most critics can say is that they don't like the idea - or that they find it distasteful.