Earlier quoted context omitted.
False dichotomy. A person who can afford to spend $25K on a watch usually has some more money left after they bought the watch. You have no idea what throwawaymath does with the rest of his/her money. Maybe your judgementalism is as much a problem as their relativism? And, by the way, the point about "relativism" wasn't about moral relativism at all.
I don't see how any of that is relevant to the point: "You could have saved a dozen lives. Instead you bought a watch. I have a perfectly objective justification for holding you in perfect contempt." Okay, granted that 'perfect contempt' is a bit strong, the reasoning seems good to me, I understand it and sympathize. How much money they have left over or what they do with the rest etc doesn't affect that in the sligh…
Here's someone with $1M. They give away $25K in a way that saves a dozen lives. They also spend another $25K on a watch. Are you outraged? Are you more outraged than the previous example because they wasted money on the watch? (Is that better or worse than keeping the money in the bank?)
Here's someone with $1M. They give away $975K, saving 468 lives. They take the last $25K and spend it on a watch. Are you outraged because they didn't also give away the last $25K? Does the watch blind you to the good they did? Or did they have to give away all $1M to avoid your "perfect contempt"?
See, you're judging their selfishness by the one purchase, not by the whole of their economic activity. I dispute whether that is a relevant metric.