Have you ever interacted with afghans?
They're pretty racist.
Just use google and you'll articles on the rare Pakistanis that happened to go to afghanistan were either mistreated or killed just cause they're Pakistani.
Forget Google and have the confidence to make your own judgement, i have relatives across the border like many of my people and believe me none has been inhospitable or anything such, we speak the same language same blood runs through our vains.
I have no issues with afghans and they are welcome in millions in to kp and balochistan and if beyond that they are not welcome then i respect that decision.