People who prodigiously swear or use vulgar-minded euphemisms (faggy, retarded) really bother me. I try to refrain from cursing or using said euphemisms as much as possible; it's odd working at a grocery score and being pretty heavy into gaming as I encounter many clods and it almost makes me seem like a wuss how I prefer not to swear. I swear when repeating something w/out guilt often, and when in domestic arguments where I get really angry (which is unfortunately rather often) about 1/3 of the language I put out is high-level cursing (fuck, shit, etc.) I do say the lesser stuff relatively frequently (stuff that is generally not censored on TV anymore such as hell, damn, ass, etc.). Aside from using the general populace as a "flag" if you will, I just realized most of the words I use rather frivolously also have dual, non-vulgar connotation... again absolving me of my guilt.
Not enough to be excessive, just enough that it's not a shock to people when I do. Usually just spoken casually. Though I habitually trim such language from my vocabulary to match certain environments.
I used to be a lot more touchy about that sort of thing back when I believed that God was taking points off for it.