That is just not true about Gary.   He can be infuriatingly inflexible when challenged, but he's certainly not alone in that.   It's hard not to lose one's temper when you are confronted with playground insults day after day.   Gary is not perfect, but it's clear that he doesn't like to hate on the vast majority of writers.    

Maybe you take his comments as insults because his opinion is very different than you own?    

With one notable exception, Don (who loves the mud fight with Gary), Gary very seldom insults the individual directly.   *He does try to make an opponents statement look stupid - which can be very hmm, snobby.  If you can't fight back with facts, maybe you just don't have a good argument?      

*I've had some long disagreements with Gary, at times bordering anger.    He will seldom give an inch, but then again he's a serious person with serious opinions.     I like Gary and he's a foundational writer on this site.