As long as I've been around, Acid Trip Skeletor was the popular nickname for our favorite/not-so-favorite crazy colored Skeletor repaint.
Heck, we even put it to a vote back in the day when no one could figure out what to call it and there were nicknames everywhere, and I don't even remember Disco on the list of option (it may have been there, I just don't recall). Acid Trip was what most fans decided on.
So... Disco...? No offense to folks using it, it's just that that nickname doesn't really fit.
He doesn't have a disco ball, he's wasn't posed in a disco stance in his package, etc.
I mean, call him what you want, most folks do.
I'll always call him "Acid Trip Skeletor" as that seems to be what he is: an acid induced nightmare.
But... why Disco?
I don't get it.