According to Osho, an answer mirrors the question and the questioner; if you are asleep in deep unconsciousness, compassion may speak sharply. What sounds harsh is a deliberate jolt—a wake-up blow—meant to pierce your slumber and provoke awareness. The tone arises from your state: sometimes only shock can reach you; gentleness might be swallowed without effect.
Sometimes a teacher talks tough to wake you up, like a loud clap to stop sleepwalking.