The original post is a great example on Arabic cultural imperialism that happened with the spread of Islam. Everything about your ancestors is bad corrupt and to be shunned and everything about your arabic masters is awesome and is to be copied.
Pathetic.
No, its not because of the 'spread of Islam', it's just Pakistani mentality. A lot of them don't quite know what their identity is. They try to shun and ignore their past and try to pretend to be what they're not. I have heard plenty of people with surnames such as Raja, Chaudry etc, saying that they are Rajput or Jatt, then saying 'my ancestors came from Arabia' or 'my ancestors came from Persia and were Arab before'. Like any of that makes sense.
And yes it is pathetic.