Ouch! When someone is inexplicably mean it is often because they are licking an unconscious wound…. Damage to our self-image can take many forms and wounds can be inflicted in any ways. From deliberate insult to personal failure, typically a bruised ego affects only the owner who feels tender(ised) on the inside… but a broken ego can shatter in to a thousand shards that leave others walking on broken glass.
Beware of your own fragility too, we are all subject to our own sharp tongues and thoughts brought on by a defensive ego!