I should have done this in the first place rather than getting in a muddle with LiW by trying to straddle two topic. This is addressed to Yie, the OP - whether or not he/she comes back to read this.
As above. As adult students are more judgmental and they 'teacher hop' throughout their piano learning phase and when they come to you, there is a chance that an egoistic adult learner might try to correct you or challenge your knowledge. As a teacher facing such challenging student, how will you deal with such student ?
Yie, since in another thread you were asking for help with piano matters, I'm sort of hoping that you're not actually teaching - but rather testing the waters to see how
you might be perceived as an adult student. If you are teaching, make sure that you know enough to be teaching, and above all, don't take on beginners because it's "easier" because this is where you're laying foundations.
If you're going into teaching an age group with those attitudes and preconceptions about them, then I suggest that you avoid teaching that age group. You'll do harm. Your prejudice will colouor how you perceive their responses and your interaction.
* "judgmental" - It is probably a tendency to fear judgment from someone your own age as opposed a child, and it may or may not be there. Make no bones about it - kids in the schoolyard also talk about their "good" and "bad" teachers - they're also judgmental. In actual fact, adult students are often terrified of not pleasing their teacher; of being imposters by dint of their age. Insecurity runs two ways, and insecurity can also create defensiveness.
* "teacher hop" - There are also kids whose parents teacher-hop them; possibly the ambitious kind with unrealistic expectations. Adult students can also get into an ugly cycle of teachers who don't teach well or appropriately (a common problem is rushing the student through with few foundations, or over simplifications, thinking this is expected - or not seeing missing foundations); (another is when good teachers won't teach adults out of principle, and then others 'specializing in adults' woo them on the wrong premises). Thus it may take several tries to get a good teacher - who by then has to try to fix the messes created by the predecessors. I've know students who stayed with a bad teacher for fear of being labeled a "teacher hopper"
* "egoistic adult learner" - You probably don't know if that student is "egotistical" - attributing attitudes is problematic. If the student is egotistical, they'll probably be trying to show you how wonderfully they play. If the student is "correcting" you, it's probably because he has studied things - has a high respect and belief in what he studied; without having the judgment to know whether this material deserves that respect. If what you teach differs from what he learned, then the music world he built for himself threatens to crumble. He may be proud of his "hard work" in learning all this stuff, wants you to praise him for it, because you're "the teacher". None of this is ego.
If confronted with a problem, you must find the source of the problem to address it. The student might also "correct" you if you made a mistake. An experienced teacher, solid in his knowledge, will welcome that and roll with it. If there are misperceptions, he'll roll with it and use it as a teaching opportunity.
If the student wants to impose on you how to teach - that's a no go. And yes, ego can exist. Also the attitude that "I paid for the lesson, therefore I'm the boss and can tell the teacher what I want him to do."
To answer your question:
As a teacher facing such challenging student, how will you deal with such student ?I'm not a piano teacher, though I'm not totally outside of teaching piano and music related things, in general pro bono. I am a trained teacher however.
(1) You don't label students. even "challenging student" is a label
(2) You get at the problem by analyzing the problem, and its source. You then deal with the problem.
In fact, my first response to you was by asking you for examples. We (collectively) could then have worked through how to deal with what you believe you're facing. There's a whole book on that part.