Maybe.
Okay, next time you tell everyone they're wrong... we'll know not to be irritated.
Who's ad hominid (sic)? I think Odinn said his contribution lacked what he was accusing everyone elses of lacking. That's not an ad hominem. Don't identify too closely with your ideas.
Um, are you responding to the wrong person? One person attacked someone's intelligence. One person did not.
I read it as annoyance and irritation. Arrogance is a different animal, and you probably won't find it in a setting as anarchic as Usenet (well, 'cept for Tholenbots). The guy just called everyone an ignoramus--whaddaya expect.
And the question (in the various ways it can be conceived) was answered correctly in the thread, contrary to the complaint, so irritation was warranted.
er