"Manners maketh man" - indeed they do, but courtesy works both ways........, and the "internet forum format" also has a bearing.
To elaborate - I've been "admin" on another (different subject) forum for some years, and inevitably, the same "newbie" questions get asked over and over again - generally people are helpful and keen to help people over the first hurdles, but sometimes if you've answered a question in full for the umpteenth time, (which is there for all to read,) and someone asks the question
again that has already been answered four times that week alone, - a newbie will occasionally get a curt or brusque reply that boils down to "read the bloody stickies/faqs".......... So it's a two-way thing - newbies sometimes don't display the courtesy of first consulting the body of knowledge already available by having a rootle through the forum or using "search" .........
Then there's "internet speak" - we all tend to use a form of shorthand, and not being keen on typing a lot of words, tend to shorten what we write as much as possible, which often means that all subtlety is lost, and often ambiguity creeps in - what we write that is meant in a kind and helpful way may "come over" wrongly (Smilies help a lot - use a word like "idiot" qualified by the right smiley, it can mean everything from "we're laughing with you" to "dangerous lunatic"
)
Last but not least, there is the temptation by newbies to reinvent the wheel
(I've no idea why, but many do...). A question is answered in great detail -an old hand with years of experience spends ages writing down how to do something, and includes pearls of wisdom like "when attending the hive, wear trousers" - sure enough, said newbie will insist bare legs and a tutu will do him ('cos he knows better).............