What I dont get is why are you trying to educate the man.
Let him and his ilk believe whatever they want to believe.
Earlier they were all the descendents of Arabs because Indians had all the South Asian legacy. This is an escape mechanism than admitting that their ancestors got defeated and converted. By accepting this theory, suddenly, instead of being the conquered, they become the conqueror's.
When Arabs treat them like $hit and dont even give them citizenship, today they are the descendents of IVC and Indians are not.
Tomorrow, they would come up with a third theory and then exclude Indians from it.
Does it make a difference to us in India? Would it make the Sunni's stop killing Shias and Christians and Hindus in Pakistan?
No. Let them keep these dreams and fancies - it gives them an escape. Good for them. You dont need to try and educate them constantly.
It is indeed very funny that majority of Indian expats work in Arab countries for money and then abuse them back home. They also accuse Pakistanis of being Arabs which the Pakistanis never have been. They also accuse Pakistanis of converting from their original religion, presuming it to be Hindu, which historically is also incorrect. Hinduism has never been a popular religion in Pakistan since the earliest times and this has been historically proven. The fact that these outlandish historical inaccuracies are repeated so many times in India makes one wonder as to why don’t the Indian intelligentsia brings out the true historical picture and present it to their own people. Is it because their superiority syndrome gets a hit or is it that they want to live in their own self perceived grandeur which never was.
I wonder why do the Indians forget that they massively persecuted Buddhism and committed untold atrocities on the followers of Buddhism since historic times. Just because they want to hide that Hindus converted en-masse to Buddhism which was the majority religion followed by most of South Asians and it was because of massive Brahmin atrocities and persecution that Buddhist religion is almost extinct from India.
Does India need a Truth and Reconciliation Commission to bring out facts of historical Hindu atrocities against other people. The Indians need to understand and come face to face with the facts about history of India which is not pretty indeed. I do not think this would happen as long as idiots like you are around, who does not want to listen to the truth.