Political racism aside i think when people of different castes interact with each other they make some picture of that caste in their minds.
For example,I am Jatt and in Punjab,it is famous that:
"Jatt a te mat nae,je mat a te jatt nae "
It means no way jatts can have any wisdom,if anyone has some wisdom,he can be anything but not a Jatt.
Now It can be seen as a straight racism but it's just a perception people of other castes have made about us seeing our social behaviour.
Similarly Sheikhs,Arains, Pathans, Saraikis are famous or infamous for other things.
So political racism aside,Pathans have very well integrated themselves in Punjab's society.Only Non-Punjabi Pushtoons complain about these things.
However, PML-N is now playing on ethnic cards which shows that they have ran out of options.And on ground level,their ethnic mantra is equally failing.
They used similar tactic against Benazir also
"Jag Punjabi jag,teri pag nu laga dag"
Like slogans were used by these choras against PPP.