Half the problem is that Musa *is* new and still in a proving state, as is the e-pub industry in general. In this Wild West atmosphere, it's easy for both overly-gushing and overly-critical comments to flavor the objectivity of any argument.
Another problem are some of the newer writers who haven't been researching and learning this stupid, insane business for long. They come to the game with higher expectations and thinner skins, and experience intense feelings of personal betrayal when an editorial comment hits home.
The key here - it isn't personal, or it's rarely personal. Editors are human, and they will occasionally let fly with some comments that can really sting.
I was fortunate enough last night to meet my agent at a convention, and hear some of her 30+ years of stories about this idiotic, fascinating business. Trust me, what you might see in a rejection slip or read on Twitter is noting, compared to some of the real agent and editorial war stories.
I cut Celina some slack for revealing some of her exasperation here on AW. Her 'tone' is not one of the issues I have with Musa.