Because there's just too many folks in India who follow cricket and follow it with passion.
The trolling of Vaughan's comments about the pitch, has been pretty rough in these past few days. But you guys can take heart from the fact that there were lots of trolls on Tim Paine after today's win by India, and the trolls went back to the SCG test where Paine sledged Ashwin "See you at the Gabba mate... your own team mates dont like you... etc etc etc".
Many Indian fans love to troll/meme people who pass out controversial stuff against Indian players. And their memories are longer because they just have too much of time on their hands for cricket.
I listen to quite a few cricketing podcasts in the UK and very often they'll say something and then make reference to the fact that they will get nailed on twitter by Indians for it.
One of them suggested Kohli was a poor captain and then pretty much retracted the comment for fear of Indian backlash.