So long as you aren't resorting to Ad Hom attacks, I have no understanding why the mods would "block" criticism of writers. I have been criticised in the comments, and I have done more than my fair share of criticising. Heck, certain critiques of certain writers are memes around here. Name a single Lewis Page article in the past while that hasn’t had some disgruntled BAE staffer making a snide comment about how Lewis often talks up off the shelf solutions and talks down expensive BAE works.
For that matter, when was the last time you saw an Andrew O article without at least one person throwing a little pie in his face? Heck, I even had a pedant (quite rightly) throw one of my comments in this thread back at me. Criticism of authors and commenters alike has never been banned at El Reg. Quite the opposite; it is a time honoured tradition.