Misanthrope

 In Moliere's play, the main character's act of misanthropy (among other things) is to refuse to praise a bad poem. 

This reminds me of the polite fiction that prevents us from telling our friends that their poetry is not very good. Generally, you can be reasonably smart and know a lot about poetry, but that doesn't mean your own work will be good. And from that mediocre position you can feel superior to many, but most of us don't go around making enemies of other poets. Because if everyone told the *truth* the institution of poetry would not survive. Generally, one's own opinion of own work is inherently biased. 

Obviously famous but also bad poets get most of the venom, because of the gap between the reputation and the reality.