Doesn't prove anything. This has nothing to do with the problems hindutva is creating in India. If shahrukh chooses to do that, so be it, between him and God. At the same time, why should anyone be offended if I politely decline wading knee deep in someone else's religious practice? Are Hindus so easily offended? I would never expect Hindus to follow an Islamic religious routine just to demonstrate tolerance. I would ask for politeness and respect for religious places and regulations, e.g. take shoes off in mosque, but you don't have to come and do sajda if you happen to visit a mosque. If an Indian Muslim joins in with shanti what does it prove? Let him. But that doesn't mean the same guy will be happy for Modi to smash a mosque and build a temple in its place. This is the problem with Indian hindutva types: you parade Muslims who do Hindu rituals around as though it demonstrates integration to the point that saffron brigades are permitted to abuse those same Muslims.
And regarding Muslim men marrying Hindu girls being some kind of victory parade for Pak, it's YOUR lot who started whinging about "love jihad". Your lot were offended by it in the first place so OBVIOUSLY some folks are going to use that love jihad to troll you. I would. If your lot didn't get offended by Muslim men marrying Hindu girls, dating Hindu girls etc, then it's likely you wouldn't get trolled for it.
Pakistanis/ Muslim men don't try to marry Hindu girls to score points or as a conspiracy but if you jump up and down yelling "love jihad" then you've basically hit your own wicket.