It does not add any value, someone is just being spiteful...

I don't mean this in a snarky way, but how would you define adding value?

(Fun unrelated fact is that I'm writing a book about this exact question.)

So maybe it is most honest of me not to try and answer that question in this context, and instead say that this is an excellent question to ask of anyone using value implicitely in these sorts of discussions.

That's exactly why I asked it.

There is no widely accepted definition of value in conversation. Even the very concept of "value" is inherently subjective.

Anyone who tries to use such words in an argument is just appealing to their own feelings, pretending they have an "objective argument". For some reason, it feels manipulative to me.