LOL! Sure! Over the years I've walked out on lots of classes, especially in the days of all freestyle classes and freelance instructors. It's a lot better now when a program certified sub will teach a standardized release.
In the bad old days, almost invariably it was a sub or new instructor that should never have been allowed on stage without supervision. And usually I would leave a note with the GFM stating what I did, who the instructor was, and why.
Three things :
Before you walk out you have to strongly feel the instructor is lacking an essential apptitude or talent for the job.
Subbing is different from regular teaching and there are experienced subs and there are opportunists.
I'd hate myself for walking out on a sub just because I didn't like their class.
As to how the instructor felt after I walked out, I hope they took it as a message.
Rex
Also remember that your regular instructor was probably the one that picked the sub, so a quick comment to them the next time you see them will be your vote on whether that sub is used again.
Excuse me... May I motivate you?