I've always said you can get more with a kind word and a two-by-four than you can with just a kind word. – Marcus

Barging in and dropping an ill-considered pile of poorly formatted question without taking the time to learn the lay of the land would be rude of newcomers, yes. :) If the presence of such a (pointed, or blunt) warning dissuades them before they commit such a gaffe then both the poster and the readers are served.

Not to mention that the warning properly styled (<span class="lazy_boor">...</span>) would make a handy hook . . . .