My parents never told me that any words that could be used in a disrespectful manner were OMG SWEAR WORDS, so I don't have this problem. (Did have an awkward moment in kindergarten playing finger puppets having missed the literal day in class when they covered not using one's middle finger, though. I joined halfway through the school year, okay!?) Never really noticed anyone other than the Doctor saying it, though I suppose it is kinda lazy writing that they feel the need to reiterate his human-mores-lacking alienness with it. Maybe if they're hoping if they do it enough it'll come off as a verbal tic or something.