Why do we always look to get offended. Peter and the other disciples are told that they will stumble in their faith on account of Jesus, and they all react like no way. It wasn't even that bad of a thing that he said. It's not like he was like you'll all kick a puppy. He was just saying that they would struggle with their faith because their leader would be dead. Who wouldn't be disheartened and disenchanted.
In general, I think we are far too easily offended. People will say things to us that they may not even mean to be bad, but we look at it like somebody just shot our mom. We need to toughen up. JM