Maybe it's just me, but I find that pretty offensive.
Perfect, I've always wanted to ask someone who gets offended by swearing why they actually get offended. So, why does it offend you? I've never understood, unless it's directed at you, why take it to heart?
Well, since you ask, I suppose I'm obliged to answer. As Jsaad said in one of his posts, he considers saying something about a particular race, sex, religion, etc. to be offensive. Society's moral compass today seems to be all about political correctness. 20-30 years ago, most people didn't think twice about saying words like "queer," "Jew," "n****," etc. The societal morality back then wasn't concerned about those things. Times have changed.
Rather than disparaging a race or religion, the F-word is a debasing and disparaging reference to sex. I suppose many people don't think of it that way at all - yes, some of the dictionary slang definitions for the word don't reference sex at all. But the origin of the word most clearly derives from sex. Some people (yes, including me) still consider sex to be a sacred and holy union between a husband and wife. The F-word is a frontal assault on the sacredness of that union - it takes something precious and trashes it into the gutter. It's a harsh, mean-spirited word that engenders absolutely nothing positive or of value. The word itself is a textbook definition of "offensive."
I don't expect anyone to back me up on this, but since you asked, I answered. Hope that helps you at least understand the perspective.