Well Duh!! Afghanistan is a landlocked country so what choice has it got other than to protest? But its not just Afghanistan who is protesting, plenty of Pakistanis also don't agree with border closure, Imran Khan beinv one of them.
Well, that's your opinion. My life experience tells me otherwise. Afghans and Pakistanis get along just fine whether back home or abroad.
You can't humiliate anyone but yourself with that behaviour. I am sure your parents will be proud if you humiliate some Afghans who come to Pakistan for treatment or work.