Honestly, the reasons you mentioned that separate Pakistanis from Indians are quite poor. It has MUCH MORE than just to do with eating beef, using cow urine or drinking milk. I've never eaten beef all my life neither has anyone in my family or my predecessors, so that defeats your argument claiming that all Pakistanis enjoy beef.
The fact that you mentioned Pakistanis brought up in the 80's know much more about the partition and why it happened than earlier Pakistanis worries me because, to be quite frank, the average Pakistani Youth today doesn't even have a clue. Coupled with your poor reasons to back up your arguments, it's also giving me the idea that you don't have a clue either.
Pakistan's creation and reason for partition was to create a separate Muslim-Majority state so we could abide by Sha'riah Law and follow the religion of Islam in it's entirety, according to The Holy Quran and Teachings of the Noble Messenger Prophet Muhammad (may peace and blessings be upon him). Pakistan was created for the betterment of the future of our youth and children so they can grow up and become leaders in an Islamic environment and follow Islam in it's entirety without being oppressed by Radical Hindus. The Muslims needed their own majority state and they weren't allowed to have it within India, so the only decision was to create our own.
Also, Pakistani culture is not too far different than Indian culture. It has only evolved since the onset of 1947. Although there are many things that separate us from Indians, you'll find that there are just as many things that bring us together. For example, Punjabi culture in Pakistan is very similar to the type of Punjabi culture seen in India. I'm not going to go into the details, but apart from religion and different idealistic values and morals, you'll see that Pakistanis and Indians are very similar.
Also, most Indians are either neutral on the issue of re-joining Pakistan with India or they don't support it at all. Same goes with people from the Pakistani side. Both countries have their own issues to deal with in future years, the last thing we want is more debating on the issue of partitioning ourselves back together. That would defeat the very purpose of Pakistan's reason for creation and existence.
You should also read up on what the founder of Pakistan, Muhammad Ali Jinnah (may his soul rest in peace), had told us:
"Pakistan not only means freedom and independence but the Muslim Ideology which has to be preserved, which has come to us as a precious gift and treasure and which, we hope other will share with us."
"We should have a State in which we could live and breathe as free men and which we could develop according to our own lights and culture and where principles of Islamic social justice could find free play."
"You have to stand guard over the development and maintenance of Islamic democracy, Islamic social justice and the equality of manhood in your own native soil."
So I hope next time, you think about the reasons for partition, that it's a much bigger issue than a few minor differences like eating beef, using cow urine etc..