SSC, have a look at your posts on this forum. You attempt to weaken an opponent's position by attacking his character pretty frequently. Calling my vantage point, and the vantage point of many others, a "strange thing to say," in order to strengthen your position is an example of ad hominem. Furthermore, requesting that I "do learn how to use ad hominem" in your very response implies that you think me ignorant and uninformed—a way of saying, "this guy doesn't know what he's talking about so you should all ignore him." You're using ad hominem to defend having not used ad hominem.
But let's get one thing clear: I am not offended, and it's interesting that you assume I am. Your opinion is your opinion and you can state it whichever way you like. My goal is to understand the logic behind everyone's arguments (a term I'm using in its logical, not literal, sense), and an ad hominem argument is a logical fallacy.
So you're saying that moral relativism exists, but not in a real, physical way that has affected society to any degree?
There are a lot of assumptions made in your arguments; forgive me if I tease them out wrongly. First, you assume that societal standards and "our laws and civilization at large" are interchangeable terms. That wasn't my position, as I don't think society's standards are the same thing as the rules and laws upheld by our nation-states. Our civil laws may be influenced by society's mores/standards, but they are clearly not the same thing. However, I think they have changed. The decriminalization of cannabis is a great example, and the legalization of gay marriage another. Neither was legal in any country 60 years ago (to my knowledge). Both of these reflect a shift in the standards of society in the direction of moral relativism.
Second, you claim that pop music is incredibly popular despite my position that artistic standards have changed. If moral relativism were a thing, then shared tastes in musical/artistic parameters wouldn't exist, or would at least depreciate such that no single genre could still be popular. So the assumption here is that moral relativism necessarily results in a shattering of commonalities and shared interests. I don't think that's the case. What it results in is an acceptance of a wider range of those parameters. The biochemical/neuronal basis of what hits the human "sweet spot" hasn't changed, but it can be reached in more varied media now. There are a lot more musical genres in existence today that didn't exist 60 years ago. Just a few that come to mind: Nu Gaze, Crunkcore, CDM, Ratchet. Hard for me to believe these would have been popular even 20 years ago.
Third, based on your final paragraph, you assume that moral relativism means folks may harm each other if the offender feels morally justified in so doing, and that the role of the law is to keep this from happening. I agree with you. I don't know if history has any examples of a civilized society that has descended so far into moral relativism that "anything goes," as it seems humans have always possessed a sense of right from wrong. Expressing moral relativism in art, however, is basically harmless, but that position is relatively new in the grand scheme of things. In a society of moral absolutes, some things were not to be expressed in art, no matter if they brought harm to anyone: religious blasphemy, the sexual act, homosexuality... need I go on? Society's views on these subjects have become much more lax in the last 100 years, reflecting, once again, the taking hold of the modern idealogy of moral relativism.
Finally, you assume that moral relativism necessitates a spectrum, and that because people fall sharply on either side of this spectrum, moral relativism must not exist. I think moral relativism and absolute morality are themselves the opposite ends of a spectrum. Those who belong to one side of the spectrum argue that nobody, not even a higher being, can call the moral shots, while those on the other side maintain that absolute morality does indeed exist and woe betide anyone who fails it. Thus, my position is that this spectrum is further evidence for moral relativism, rather than evidence against it.