We have taste for Krishna's names and His mercy in the form of Prasadam. And it grows as long as we  don't offend the Vaishnavas and The Lord. Similarly the taste for offensive attitude also grows with someone who already has begun offending. It needs correction before it grows bigger and bigger. We see from Caitanya Lila that there was one who went to extent of offending even Lord Caitanya for eating more as a sannyasi. 

In Krishna Lila, Rukmi, Jarasandha, Sisupala all of them offended Krishna and their offenses had to be stopped at some point otherwise it was not good for them. So The Lord punishes miscreants as a father for the benefit of the child.

A big ship is held at the port by a small iron part. Similarly our soul can be saved by simply controlling the small part in our big gross body - tongue in our speech and eating remnants of food offered to Krishna.