The Australian wicketkeeper made the claim after his side won the second Test in Sydney.
Haddin told Sky Sports News: "We know this side can be as fragile as any team in the world if things aren't going their way.
"We knew if we could keep them out there [in the field] and put the numbers like we did on the board we knew we'd get the rewards because they break quicker than anyone in the world."
Indian bowler Zaheer Khan replied angrily to Haddin's comments and chose to criticise the Australian vice-captain.
Khan said: "Well, Brad Haddin, I think he should focus on his keeping, that looked really fragile to me.
"He needs to start moving."
The third Test between the sides will begin on Friday morning.