In technical discussions, rudeness and informativeness are orthogonal. There is some information that is not polite to convey (such as information about someone else's personal/physical characteristics) but that information isn't relevant to technical discussions. Sometimes there is a choice as to how rudely one wants to convey a particular fact, but that is indeed a choice that reflects more upon one's desire for politeness or rudeness than it does any actual constraint on the transmission of factual information.