Hence boss should ensure that criticism should be positive helping the performer to enhance his efficiency and it should not be in the form of back biting which could result in a negative effect.
Even in our offices when something wrong happens. the question asked is who did it and the action will be based on the person who is responsible for the event. That is not a way to be followed.
We should welcome constructive criticism from all. We should take all the comments made by the person as a way for us to improve and try to improve by understanding the points raised by the other person. One should not get hurt by the negative points made by others.
Moreover sometimes there can be a tint of bias in this way or that way, especially when the author or creator or performer is known to the critic.
However the ideal situation is when the critical evaluation is done based on certain norms and evaluation parameters. Then the criticism will serve its purpose.
A wise person will never bother about the critics and will take it just sportingly and in its normal spirit. Once the true intention of the critic is known to us then we can always decide to take his points casually or seriously.
Knowledge is power.