Life at an IIM
Do not give a fu*k to them. Your success will slap them. The more you think of them, the more you will be stressed.
In my personal opinion, be honest and put a foot down - tell them it is not acceptable and you'd appreciate if they don't repeat it. Often we let ourselves be considered a pushover which is when this happens.
If they still persist, raise it to your team leader/HR. If that doesn't help, change your company - it doesn't deserve you.