In fact, it seems to me and many (most?) people that underserved pain (in the aforementioned sense) is bad regardless of what attitudes other people have about such pain.
I’m a moral antirealist, and I myself think that undeserved pain is bad regardless of what attitudes other people have about such pain. The reason I think such pain is bad is because I disapprove of it. So what you’ve described is completely consistent with antirealism. For comparison, I think pineapple on pizza tastes good regardless of what other people have about it.
What would be required for a person’s stance about this scenario to suggest realism is if they thought that pain was bad regardless of what anyone thought about it, including themselves and the person experiencing the pain. That is, they’d need to think that the pain would be bad even if they didn’t think it was bad and even if the person experiencing the pain didn’t think it was bad. And I don’t think most people think this.
I’m familiar with phenomenal conservatism (I’ve directly discussed moral realism with one of its main proponents, Mike Huemer here, and have written a bit about the topic such as here). I don’t endorse it, but even if I did, I think its frequently misused and isn’t going to do much to support realism. At best, phenomenal conservatism provides one with a private, extra source of “justification” for one’s beliefs, but it has little dialectical force in an argument. The fact that something seems a certain way to you may matter to me a little bit to me, but if it doesn’t seem that way to me (or it seems that the contrary is the case), how things seem to you won’t count for much.
I’m a moral antirealist, and I myself think that undeserved pain is bad regardless of what attitudes other people have about such pain. The reason I think such pain is bad is because I disapprove of it. So what you’ve described is completely consistent with antirealism. For comparison, I think pineapple on pizza tastes good regardless of what other people have about it.
What would be required for a person’s stance about this scenario to suggest realism is if they thought that pain was bad regardless of what anyone thought about it, including themselves and the person experiencing the pain. That is, they’d need to think that the pain would be bad even if they didn’t think it was bad and even if the person experiencing the pain didn’t think it was bad. And I don’t think most people think this.
I’m familiar with phenomenal conservatism (I’ve directly discussed moral realism with one of its main proponents, Mike Huemer here, and have written a bit about the topic such as here). I don’t endorse it, but even if I did, I think its frequently misused and isn’t going to do much to support realism. At best, phenomenal conservatism provides one with a private, extra source of “justification” for one’s beliefs, but it has little dialectical force in an argument. The fact that something seems a certain way to you may matter to me a little bit to me, but if it doesn’t seem that way to me (or it seems that the contrary is the case), how things seem to you won’t count for much.