Now, I can understand if an author deletes comments that are indulgences in senseless profanity. What I cannot understand is authors that delete comments that provide genuine criticisim. Yes, it's looks great if everyone gave you 100%, but if the only way to get there is to throw everyone out who wasn't really convinced, what credibility does such a score enjoy? If a story doesn't compute for me and I specifically state what the factors are that defy my suspension of disbelief, why is it such a bad, bad thing to point this out? 
I think it suggests a great deal of personal insecurity if the fact that they cannot please everyone is so offensive to some authors. It should be obvious that not every story will please everyone -it's nigh impossible to always make everyone content. So if someone didn't like some parts of your story, ponder if they might have a point, weigh their arguments, and if you come to the conclusion that you did everything alright and the story apparently simply wasn't to the critics' taste, have the eminence to stand above the criticism. Whitewashing the comments in my eyes only ruins your own credibility.
I think it suggests a great deal of personal insecurity if the fact that they cannot please everyone is so offensive to some authors. It should be obvious that not every story will please everyone -it's nigh impossible to always make everyone content. So if someone didn't like some parts of your story, ponder if they might have a point, weigh their arguments, and if you come to the conclusion that you did everything alright and the story apparently simply wasn't to the critics' taste, have the eminence to stand above the criticism. Whitewashing the comments in my eyes only ruins your own credibility.