My personal opinion is: The questions like I asked a few days ago and Devils_Spawn asked can be allowed, because in my case, I specifically asked if such a category exists or not. Further, I find nothing wrong in knowing common names of some colors. It's not really opinion based. I would find it strange if someone tells me that your avatar (my old avatar) color doesn't have a name. I mean you can't call it something.
I feel Devils_Spawn question could also be answered, because I think all he wanted to know which is the closest color to that palette. It wasn't opinion based.
Of course, some users might perceive colors differently, but in general, as a graphic designer, your clients (at least in my culture) expect you to know common names. For example if he asks what is the color in my avatar. I can't say him it's opinion based. I would like to tell him truth, if not exact color name. For example, the truth like - the color of my avatar is between blue and green.
Similarly, for Devils_Spawn, even Wikipedia is saying it is shade of orange. And I think that would be a sufficient answer to that particular question.