Any practice that involves killing of living beings and spilling blood for pleasing god should be considered backward. Agree Hinduism too had/has such practices but more and more Hindus are standing against such practices instead of blindly following them.Sati being a good example of what? Foreigners / conquerors teaching some humanity to Hindus.
And we are talking about people who were seen worshiping Trump's posters and cutting cakes for him. So who in Hinduism decides and defines what practice is to be labelled backward? I can point to many practices, would Hindus accept my suggestions?
Animals are no less than humans and should have equal right to live. The teaching that considers them inferior to humans and hence justifying murdering them should be abandoned.