Hey, why limit it to skiing, and lesson takers?
A million years ago I worked at a pretty prestigious bike shop in Southampton, NY. The cycling equivalent terminology for gaper is Fred, and ironically the staff pretty much never referred to the clients as Freds; that term was reserved for me alone. 20-some years later I will occasionally call the owner, or one of the staff that still work there, and as soon as they recognize my voice, I'm greeted with an enthusiastic "FREDDY!" I also helped start up a bike club through the shop, and was easily the most active ride leader for the first two years of its existence. Many who rode with me just assumed my name was Fred (it's not btw), to the great amusement of my co-workers.
Not specific to lesson takers, but for years, the Killington equivalent terminology for gaper was Herb, after the character in an 80's Burger King ad campaign; "Have you seen Herb?". I'm a little surprised that the term doesn't seem to have migrated to areas beyond Killington, but whatever; I still occasionally find myself muttering "Herb" under my breath when I see someone doing something gaper-ish. It doesn't really matter that no one in Colorado would have any clue about the mean, awful insult I just hurled at them.
Of course I don't instruct, but personally don't know of any derogatory terms specifically aimed at lesson takers (other than Texans). Most of the derogatory terms I know are reserved for skiers lacking skills, who refuse to take lessons, and of course, for heckling between friends. "Texpert" is one term I've heard used to describe a skier who insists on checking expert on the rental form, regardless of their ability, and who will naturally decline to take a lesson since, you guessed it, they're already an expert. I'm also familiar with the term citiots, but AFAIK, that terminology isn't specific to skiers, or lesson takers, but more of a derogatory term used by elitist mountain folk to describe their urban brethren.
If I ever do meet any bears IRL, feel free to call me gaper, Fred, MT (empty), JONG, n00b, or any other slur you can imagine, and I will happily respond in kind, after which we can hi-five, bump fists, secret handshake, or whatever's clever, and then get down to the vurry surryous bidniss of having fun. I'm all grown up now; sticks and stones, and all that...
I'll just leave this here then.
Edited by MT Skull - 10/5/14 at 12:57pm