Why Afghanis hate Pakistan so much? A historical perspective through racial context.
The aminosity is deep rooted in the Afghan culture and history. In the last millennia, every invader (mostly Turkic) first conquered Afghans and then marched towards Subcontinent(aka golden sparrow) and Afghans were used as cannon fodders in those conquests. Subsequent conquests of fertile Indus planes by Afghans in the Turkic Armies gave them an inherent superiority complex that somehow they are better than the darkies living in those fertile lands.
After the British takeover of the subcontinent, Afghans lost the 2nd Afghan War in 1893 (Durand Line Agreement) and gave the territory of KPK to the British Empire and it acted as a buffer between the British Empire and Russian Empire and was reinforced by further agreements.in 1908 and 1919 with of Afghanistan. The Durand Line Agreement was supposed to be of 100 years though it isn't written in the agreement but in the 1940s the British Empire collapsed and Pakistan inherited the NWFP (now KPK) as a successor state via referendum. The Afghan King of that time objected to that and refused to recognize Pakistan in the UN in 1948 started the Pashtunistan movement and armed Faqir Ippi and his fighters in Afghanistan but Pakistan foiled this insurgency and Faqir Ippi surrendered.
Pakistan's 1st Prime Minister was murdered by Akbar Khan who was a soldier of the Afghan imperial army at that time. They invaded Pakistani Tribal Areas (FATA) twice (1953,1960) and were ragdolled by Tribal Militias and Pakistan Army. The communist elements of Afghanistan invited the Soviets to AFGHANISTAN in an attempt to annex KPK during the cold war and you know what happened after that. So today Afghadus hate us because they can't do what they always did to the people of Indus anymore. کھسیانی بلی کھمبا نوچے۔
The topic is at least 200 pages to cover. I haven't added. I haven't added the geopolitics around 1920 Indian Muslim Migration towards Afghanistan in Khilafat Movement and Afghan Betrayal also the events that unfolded post 9/11 and before invasion of Afghanistan by NATO.
Edit: this post was deleted on r/Pakistan by a mod. I swear, if I found you someday 😡🤬