Amala,
I will speak for myself but first tell me how do you attribute an Indians hostility towards Pakistan as motivated by racism. We are the same people as you say. So surely its not the race that motivates my hostility.
My hostility towards that artifice of a nation is due to What it represents and its inhabitants who have brought into that narrative lock stock and barrel. Even the most anglicised of them.
It is the very negation of the Idea of India and its reflexive anti India hostility is based on the false belief of Evil 'Hindu' India. It has no sense of nationhood except that it is not India. The day this hostility goes, the artifice that is Pakistan will unravel.
Add to it the continuous mayhem it has wrecked on India through terrorism like 26/11 in Mumbai and Bangalore blasts to name a few. This terrorism has ensured that even those in South India who didn't have the baggage of partition are now hostile to that artifice(Witness Prasad ji's statement).
Also the idea that Indian and Pakistanis are the same people(atleast the Punjus) was true in 1947. Today this myth is kept alive by woolly headed liberals in either bollywood or in Aman ki Asha brigade. Post 1947 both nations have had a different trajectory. Whatever be India's fault (there are many), we have been able to generate a sense of nationhood in some measure and the locus of that identity is internal.
As to your point that punjus on both side of the border are the same, well we may have the same genotype and phenotype. Even same language and culinary habits. However we are NOT the same people any longer. Not in any substantial sense. Sense of person hood goes beyond genetics. I can confidently say that 65 years after 15 August 1947, thanks to improved communication, greater physical mobility and shared popular culture ( cheesy as it can be bollywood is a major artery of national integration), an average punju in India is more likely to feel kinship with a Tamilian than with punjus on the other side of the border. I am not saying this for effect just because am posting on a board composed of predominantly Tamilians. I mean it and have felt it in some measure. Both the nations have moved apart that much.
So I dont think the hostility is because of racism.
For the bolded portion, the hope is idea of India and constitutional nationalism.
. It must show Providence has a wicked sense of humour or what.
Pakistan, like India is made up of multiple ethnicities. Its just the idea of Pakistan and to some extent its personal. My friends from school have faced bullets from terrorists sponsored by that state(mercifully no fatalities). Also during Kargil war I was trapped in Leh (Ladakh). I saw coffins of soldiers being brought from battlefield to airport. I was 20 and it left a big impact on me.For India Kargil was a stab in back. Since then I have a really low opinion of Pakistan.
