That's the hypocrisy: not seeing the block of wood in the eye of one while complaining about the speck of wood in the eye of the other.
By trying to be less hypocritical we create a more level playing field based on facts, instead of gut-feeling based hatred.
Whatabboutism is, IMHO, used a lot as a way to circumvent having to address the glaring hypocrisy: i see it's used to shut up those to point out hypocrisy.