It's very natural to feel a bit defensive in response to criticism of this nature, which is actually an ad hominem. I don't know that many people would have done better. I think we have to remember that even larger-than-life characters like sama are also humans who feel emotions.

I honestly think it's a valid comment. If I see something from someone I don't think has anything to teach me (though I try to be charitable in that determination), I just don't read it.