Shantideva ..... mentions specific instances when it is advisable to remain like a mindless piece of wood. We can do this when our mind is very distracted or when the thought arises to belittle, slander, or abuse others. If pride, haughtiness or the intention to find fault with others, we can also remain impassive until our delude motivation fades. Feeling pretentious, thinking to deceive others and wishing to praise our own qualities, wealth, or possessions are all occasions when it is wise to pretend that we are made of wood. Whenever we have the desire to blame others, speak harshly or cause disruption we should practice this technique of non-reaction.
-- Geshe Kelsang Gyastso, Meaningful to Behold