I have to wonder if self confidence is a problem for the magic community in general.
We're performers. The need for approval is what drives us or, at least, is what motivated us to take up a performance art in the first place. Of course self-confidence is a problem. But also, sometimes, love for our art is what motivates criticism, whether it's constructive or not. When we see someone, in our opinion, despoiling the thing we love by sloppy performances, badly thought-out releases, or whatever, it creates an emotional response. It's like someone's insulting a friend of ours. And, while writing a blog defending our friend against insults might not be everyone's response, it's certainly understandable.