1. Look on Youtube -- "even the Taliban hate Pakistan" -- it's by a respectable documentary maker -- I think there is a piece on the subject by someone like the daily beast or mother jones on the like
2. Read what Mullah Zaef -- Afghanistan's Ambassador to Pakistanis says in his book, my life with the Taliban
3. You can read / watch what former Taliban say about Pakistan/Pakistanis
4. I think the Taliban call Pakistanis "Black Legs" try Googling that
5. the US to fracture the relationship between Pakistan and the Taliban -- showed Pakistanis of what Taliban say about them -- Google that
6. You can also read what the Queta Shura and senior Taliban have said on the appointment of Mullah Manor -- on of the reasons they cite is that the appointment was done in Pakistan .
I think the above should be sufficient to get you started.
The hate for Pakistanis amongst Afghans did not start 2001 or 1994 or 1979 -- it has been brought to a simmer since 1947 (and one can argue even since before that) -- it is part of the Afghan national psyche -- you can see on this form people who probably grew up in Pakistan
@Sher Malang @A-Team who grew up in Pakistan -- they do not support Pakistan on Kashmir.
Afghans do not have the "Muslman Bhai" syndrome -- as Pakistanis, Turks etc. have (and I don't mean a spiritual/religious sense but as a Muslim cultural identity similar to say the Jewish cultural identity)