JWhipple I'm so sorry to hear about your fish.
mikev,
I don't know that I've run into the actual term "Skinny Disease" anywhere applied to fish other than loaches. Elsewhere I've seen myriads of comments/questions about fish that are wasting away, getting skinny, etc, but the specific term SD seems to be something of a loachism.

There have been other discussions here regarding it, and the consensus is that the name is misleading, so you do have support in your viewpoint. Nevertheless, it seems to be hanging on...

Whether someone uses CWS or skinny disease, just depends on the person, I guess.
As for "The question about it being "contagious" " not making sense? I think it is sensible for someone who knows little about something that kills fish to ask if it is contagious. I would.