How High caste hindus treat low caste Dalits in India

Because you have no idea.

Vital aspects? So if you take out caste, hinduism is dead: is that what you mean.
Manusmrithi is the only book that talk about division based on work (read caste). And nobody worship that except some hardcore brahmins.

This is exactly why I say you dont have any knwledge of present day India. Castism is now in place majorly because certain section demands and wants a positive discrimination for them in every aspect of life. Read reservations.
Do you know about Mayavati, who is all set to or trying to be the prime minister of India. Who is she? Help youself and google.
Do you know about the current chief justice of India. What is he?
Do you know about the former president, KR Narayanan. What was he?
All three are dalits occupying, aspiring to and occupied highest office of the country.

Because there is positive discrimination based on caste people including muslims want to be considered on the basis of caste. If such system existed in Pakistan then there would also be people demanding reservation based on what caste they descended from.

If I type islamic terrorism I will get every link to Pakistan, hence my point that caste takes a back seat in your country where terrorism is a major issue.

I am not saying that India does not have castism. It has but the influence it has on discriminating people is coming down drastically except at times when caste becomes an issue for positive discrimination.

If you say so I have to believe you. But GS gave me an impression that there is a lot of discrimination based on what kind of tribe you come from.
I have many rhetoric questions to ask about Islam , but I wouldnt as this would offend you terribly.

I believe you are wrong. there is nothing like that in Bhagvad Gita.