I plan to have a polite discussion with them, but I haven't seen one of them for a few weeks. I don't know if we're there on different days, or if he's busy with his day job, or what.
I thought I should give a little context as to why I brought this up on the board. Since I'm new to MT, I've been reading through the old threads. I found a pretty interesting one from 2006 titled "Things That Drive You Crazy in the Dojo." In it, one of the posters included: Students who correct an instructor by saying " well sensei so and so showed me this way." That made me a little mad. I mean, if a student is being shown 2 different things, why shouldn't he bring it up?
Rather than reply to that and bump a 9-year-old thread (that's something that drives me crazy on message boards), I started this one. Now, reading it again, I realize I may have missed some context. I was focusing on the second part of the statement and glossed over the first part (Students who correct an instructor...) Perhaps this poster was venting not about the student bringing the situation up, but how he did it.
Thank you all for your advice. I will proceed humbly and respectfully.