Taliban are afgans i suppose...they hate paistani army ...poor kids
the afghanis that hate the paki army are the general afghani public, their political class, and warriors of the northern alliance. otherwise, the afghani taliban has had been fully supported by the pakistani army in every way.
however, since the US offensive in afghanistan, most talibanis fled from afghanistan to border tribal areas in pakistan (the FATA and NWFP). these had afghanis, arabs, chechen, uzbeki etc. militants. the paki army first made a deal with the tribal warlords of those regions to enter those areas for its combing and flushing ops in exchange for funds and development works, but the deal went awry (ofcourse, the paki army/govt. didn't/couldn't keep its promises), several tribals turned rebels (they have been traditionally warriors anyway, so they had to resort to violent ways under the given circumstances, ie, those of ultra backwardness, ignorance, poverty, gullibility), plus, on account of the reasons i just mentioned in the parenthesis, the (runaway or imported) mullahs there 'helped' spread the wahaabi poison there, creating bitter impressions in the minds of the tribals, and another monster named TTP, an umbrella group of the taliban, rose there later. royal mish-mash and hoch-poch!
the pakistani army has been under pressure from the western nations to flush out these scumbags, and hence the thorn between the army and the wild dogs there. come to think of it - the monster that pakistan nurtured with such dearness in afghanistan, to wreak havoc in that country and the surrounding areas, came running all the way from that land to finally feast on the flesh of its own master and nurturer. so now, apart from the afghani people, the pakistani army's own natural offspring with bloody fangs has also turned its hater, though not because of the same reason(s) as the general afghani population!
hope i am more-or-less correct here. thought of elaborating on the point.