Okay, so you're now saying that racial slurs must be taboo, but the F-word should not be. I have former students who disagree with you on the racial slurs point, and they argued with me on that too. Many of my former students thought it was okay to address each other with a certain racial slur (which didn't apply to them or me). When used in that context, it was not a racial slur, they said. It was like saying "buddy" or "dude" or something.Every rightly taboo word has a very understandable reason for it to be so (racial slurs, for example).
I didn't agree, and I told them no matter what the word might mean to them, the word has a history. To blurt that word out in public would make them appear to be racists.
My point is, you probably agree that my students are wrong to think a racial slur is harmless, but I don't see how that's any more in denial than saying the F-word is harmless. Harmless to you, harmless to me (though I don't say it in front of the kids), sure, but for many the word invokes negative feelings. You can't fault people for being bothered by the F-word for the same reason you can't fault people for being bothered by racial slurs. The F-word means "sex." [Racial slur] means [race].
What about the middle finger? You were born with that, everyone has one, and it's not a private part. So why can't you just flip everyone off? When someone asks what's wrong with you, you say in an innocent voice, "Wha-a-a-at... it's just a finger. I point with it because it's longer than my index finger; therefore, it's the better pointing finger. Hey, look, an airplane! Oh, I offended you? Well that's your fault for allowing a harmless finger to offend you."