Basically, I'm not offended by swearing, I just find it unnecessary and annoying, when it's used to such an extent.
Jay Leno and Jerry Seinfeld, two of the most popular comedians ever, have been quoted before as saying that they rarely, if ever, curse in their acts, because it adds nothing to the humour, but some cheap laughs from shock value, and I think that can be applied to music as well. Take Eminem, for example. Personally, I think, for rap, he's half decent. His songs often have some sort of meaningful message, and they're catchy.as all get out. But in many of his songs, he's saying f*** every 5 seconds. Does it add anything meaningful to the song? No, nothing but shock value.