I tend to be insulting and dismissive as a matter of style; ask anybody on the old rec.audio.opinion usenet site where I used to hang out way too much. Insult swapping was SOP at that location. Often, the only way to get somebody's attention and get them to say what they really mean is to twist their tails a bit.
In any case, we have us a peaceful crowd of AR fans here, and when somebody (anybody) comes in and, politely or not, basically makes claims about the inferiority of the product line, I find that to be, as you noted, arrogant, insulting and dismissive - and immature - as simple as that. Sure, we can have debates about the good and bad points we find with AR speakers of the "classic" era, but some of the negative things being said about the product line (and indirectly about the competence of Villchur and Allison) are going to rile some of the regulars.
And I can say that even though I am a relative newcomer here, at least on a regular basis.
1- The crowd only becomes unpeaceful when people rise to provocations, and the thread goes critical. I'm just trying to be a little graphite in the reactor, here.
2- You fully well know my history on rao, I think: I enjoy a good work-'em-up and smack-'em-down as much as anyone. But, this ain't RAO, and I don't believe many people want it to become RAO.
3- Corey is not a jerk, any more than reviewers who have trashed my products and philosophies are jerks.
4- In the Jr. High School crowd I hung with, there was constant bitter debate about which guitarist and which guitar. "Clapton is God." "Clapton can't lick Hendrix's [frets]." "No real guitarist plays Tele's. Only Page, and he's a fag." "You're a fag, and you like Simon and Garfunkle!" "Do not." "Do so." You would think the whole world took sides like this. What a shock it was to grow up and learn that 99% of these guys were friends, respected each other, borrowed each other's guitars, went to each other's shows. Likewise in audio. Most pros really respect each other, and find kindred spirits in people who have figured out how to survive in the business. Controversy sells, and nobody is above that. But, 99.999% of it is theater.
5- The world is impure. Fight it! Really. Just don't set up false dichotomies. Guys on one coast get busted for giving coke to their larger retailers. Guys on the other coast go to jail for taking kickbacks from their suppliers. On and on. Hifi was a big industry in those days, ad budgets were 7-figures, and it could support much more corruption than now. If you don't think AR did it's best to wine, dine and strong-arm the mags, well, you must have been at a different party. Only the engineers never got any, as usual. "Yes sir. Yes, I will have it by Monday. I promise! Of course I didn't have any New Years Eve plans, sir... I know CES is always the first week in January!"