Well, I never said "if you curse you're ignorant." As I said, among familiar company, I swear an absolute fuckton. (Ha.) But I'm also acutely aware of the "low-class crass" trope. More often than not, if every other word that comes out of a character's mouth is "fuck," they probably fit that description. That's not necessarily a bad thing, and I've found that it's usually the player's intention in the first place. I simply think that the game has given us a number of colorful alternatives as well as more general templates for everyday Eorzean speech, and I find it far more immersive to actually use those.
Obviously, I don't go around telling people how to roleplay, or shun everyone who feels differently - ask Virella or Meyla, as I've RPed with them on several occasions, and they both have characters who use "fuck" as if they were in a Tarantino film.
No worries, I didn't think it was a personal attack, it's just a weird thing to do by default to characters who curse, that's all. You gotta do you in the end. <3