Most families in general don't warm up to their children being different and this intolerance and hatred is mostly stems from religion - what is taught in these religious books and the temples, churches etc In hinduism, gods are either male or female.
Indian families on the other hand are over-the-top when it comes to tolerance regarding their children. Whether your child marries into another language group, then there's the cast superstition and they would even disown their children if they got divorced. It's like "don't bring shame to my name", even if you're stranded with no place to go. They have the most superstitious beliefs in the world.
I know of many Indian gay or lesbian people in South Africa. They've left home and lived their own lives without problems. Yes, their family would wash their hands over them but then it's their (the parents) loss, not the individuals living their chosen path. I had two gay guys in my class at school (Indian school in SA), but we never made them feel less human and they were accepted amongst their peers. ...but in the case of these two policewomen in India, it speaks volumes about how backward the community and society is in general in India. India needs to shake herself off from what keeps them behind.

Not just India.....why are you singling out India?

Homophobia is alive and well everywhere, generally to the degree that that part of society is influenced by religion, any religion.