We have learnt that there are a lot of monkeys there, but interestingly, they are only harassing the beautiful Jackie without troubling Ranbir. They have been eating away her bananas and other fruits, being over-friendly with her and once, even attacking her in her villa all at a time when she was alone.
No such incident has happened with Ranbir and so every time Jackie tries telling him how she got harassed, he refuses to believe her, as he has not experienced it at all. Well, obviously the monkeys there are very selective and discreet and like the beautiful Jackie over the handsome Ranbir.