Being ironic is being against being arrogant. Being cold is against an arrogant attitude.
Silence is acknowledging that you are unable to say the essential or accepting that you have nothing to say. Heidegger said: “Before talking, you need to listen to your inner voice. Thus you may have nothing or very little to say. Only in this way the word will regain its priceless character and then you can actually live inside your own human being dwell”. Not being silent means introducing inflation in the spoken world, being superficial and risking always to regret what you said.