It is pretty easy to level the "Participatory Narcissism" attack at most people with extensive, opinionated writing.

Quite often I will look at comments I have made and reflect at how skillful I had been (before being methodically torn to shreds by smart people), so I hope narcissism is a common phenomenon. And I also hope (for my own sake) that for most people the matter at hand is trying to suppress self-gratuity in their writing, rather than not having it in the first place.

Expressing one's opinion is, to a degree, a narcissistic act. IMO it's more ironic when critics cannot be critical of themselves (not saying it is the case here).