It's Grant Morrison, whom he roasts as only a literary master can.
....for thirty years I have had to patiently endure the craven and bitchy hostility of someone who, when I bother to think of him at all, I think of as a Scottish tribute band. While he is clearly not the only reason why I have come to feel actual revulsion for the greater part of today's comic world, he has probably done more than any other single individual to foul its atmosphere and make it unbreathable with his ongoing reeking incontinence - and that, believe me, is in a field where he has enjoyed a great deal of vigorous competition. There are perhaps a dozen or so people in the industry that I respect immensely and with whom I am delighted to both work and remain in contact, but the rest of it is a comic world that I don't wish to take any part in...It's hard to see how my withdrawal is going to greatly inconvenience anyone, and Grant Morrison will have finally vindicated all those long years of effort by at last getting my full attention for a few hours.In a lengthy, highly wordy and specific interview with blogger Padraig O' Mealoid that you really should read all of, he also explains why he won't be doing many interviews any more, why it's unfair to caricature him as the guy who always puts rape in his stories, his reasons for including the controversial Golliwogg character in League of Extraordinary Gentlemen, and why you should never ask him to sign a copy of Watchmen, V for Vendetta or anything else he doesn't own completely.
Based on the above image alone, somebody should also have asked Moore if he, in fact, is the real Mandarin.