GolfingJMan: I agree that it could be better termed popular misconception or popular misusage because the Latin etymology of the word "misnomer" indicates the misapplication of a name.
Well then,
GolfingJMan: I have a dictionary on my computer and it says that a misnomer is an "...unsuitable name or a term...," and the "term" part of the definition is what I was using when I used "misnomer," not necessarily the naming aspect of that definition.
Since I still think you misused misnomer, then by your definition above that makes your use of misnomer a misnomer!
LOL
OK done.