There is a fundamental difference between the way I handle criticism or slander and the way Jesus handled it. Namely, he wasn’t a sinner.
When the Pharasees or whomever else talked smack about Jesus, he knew they were full of crap.
When someone talks smack about me- no matter how harsh-, there’s virturally always a level of truth in the accusations.
If Jesus was silent, what makes me think I have the right to defend myself?