It seems in GENERAL an average afghan Hates pakistanis like an average pakistani hates indian, why is that?

First of all it's not like India and Pakistan.
Secondly we, Pakistanis, are not responsible for that hatred. It's their problem, they have to deal with it. They live here in our country, they make very good money, our Govt. helps their country but they never appreciate. They are very self righteous.
Another thing is that most of us, the Pakistanis, we don't love country, we don't respect her honor. It's easy for us to abuse our system, our Govt., our Army/ISI, our people then how can you expect afghans to respect or 'like' Pakistan.
The afghans living in Afghanistan don't share they EXACT perception. The ones who do, they need to be enlightened of the ground realities.
Another aspect is our media and the rest of the world's media. We do not have a 'media' which can support Pakistan, which can fight for Pakistan. It's all about perception. We don't have a single English news channel, how will you counter osama's killing in the media war??? With Hamid Mir, Kamran khan??? come on :)