That's vague and subjective. Your definition of "douche" could be far removed from mine and even for douches I don't really paint things in terms of "good" or "bad". I could use this service and see it as a way to protect me from accidently offending people who take life far more seriously than I do. Hell, another HN poster has already taken it upon himself to vet my tweets for offensive things I shouldn't be saying in public.