There will alwaye be people who think they are better than others because they belong to a certain family/clan/tribe, this doesn’t just happen in Pakistan, it happens all around the globe. However, it is NOT because of the caste system, it’s because they are proud of who they are. It has more to do with tribal honor than anything. Like I said, we don’t know what we mean when we talk about caste.
Do you realize that Pakistan has been Muslim for centuries? Pakistan before independence was not much different than it is now in terms of traditions and cultures. It is more Indianized now than it was ever before! Muslims never had a caste system, they organized society based on ethnic groups, clans, and tribes. This is so not the same as the Indian caste system. There are remnants of Vedic/Hindu/Zoroastrian traditions in Pakistani society but caste system is not one of them.