Irony in your post is that Indians tell their unwanted countrymen to go to Pakistan, so even in petty Indian minds Pakistan is more welcoming than India.
There is no Irony in telling pakistanis who live in India to go back to pakistan.
After all "pakistan" is an idea and anyone who believes in that idea of pakistan is a pakistani and needs to go back to his home country ASP.
Hospitality of pakistan to its own recognized and unrecognized citizens is really not our concern.
They can always visit us as guests and regert their decision or join the MQM.