I truly do not recall anything remotely approaching rudeness at DC. There might be an occasional misunderstanding or quick reply, but the level of respect shown others is exemplary. In my experience, tech forums are generally civil when the members are knowledgeable in the matters at hand. For incivility, try Usenet. alt.comp.freeware has good information, but it frequently nearly buried in the personal attacks of some of the posters (As you may well recall, Mouser)
DC is a haven and an invaluable resource. I don't remember how I stumbled across it, but I've a cheerful supporter/user ever since.
my 2 pennies