Don't blame the messenger. Anyone coming out with remarks and reactions like Vail's in that thread in a conversation held in person would attract the same reaction.
People can't have it both ways- this is a public forum with a large and varied sample many countries' populations. The upside is anyone posting can reach thousands of people instantly, the downside (if you choose to see it as a downside) is that many of those people will have reactions and the desire to express them, and they may or may not know what the poster's qualifications are. Some gain respect by their postings, some by their career and life achievements and the fame garnered this way, just as some garner ridicule and approbation. This is often unfair, and undeserved praise and ridicule are part and parcel of this.
I'll take this any day over a rigid and hierarchical system where respect and obedience is automatically accorded the powerful and the successful.
Hey, I know it must be crappy to have spent a lifetime developing skills, knowledge, and experience, and to have an honest desire to share these same, and then have some little wet-behind-the-ears punk question one's information or motives, but if that person can't accept this will happen then they have no place on a forum like this, and shouldn't be surprised when the inevitable happens.
How much of what we all do here is down to ego and vanity, and how much is due to an unselfish desire to share knowledge? if we looked inside ourselves honestly there are few of us who could say there wasn't a bit of vanity and desire to be heard and respected mixed in with our desire to share.