To answer the original question - if you're happy, and the school is happy, I don't think it makes that much difference. I began teaching a kids' class on Saturday mornings affiliated with (but separate from) my instructor's class when I was a I Dan. That class continued, in one incarnation or another, through to this day. By the time I was a II Dan, the class had moved to a separate location, which is where it is now, although his color belt students visit my class and mine visit his, and the monthly red/black belt class is held at his facility, and we trade off teaching it (I'm now a IV Dan). While I understand the historical perspective, and think that the gentleman in question was complimenting you, I also understand your reaction. I was a pretty slow tester (for several reasons, largely involving graduate school) and spent 7 years as a II Dan - but it wasn't a problem for me or for my students.
To answer the other point that came up through this thread, I know plenty of students who would not be able to teach an independent class at I Dan, although they are certainly able to assist or teach smaller groups - some because they are not able to explain, and some because they don't THINK they are able to explain (some correctly, and some not). I do think that all black belt students should help with the class, and there are quite a few ways they can do it - but I also know of an instructor who was promoted to VII Dan (which is Master Instructor in the ITF) without ever being an independent instructor - said person taught in other peoples' schools on a regular but not always predictable schedule, and never had personal students (that is, students who consider said person to be their own instructor), and certainly never took a student from white belt to black belt - at that point, HOW can you be a Master Instructor if you've never been a student's instructor? Therefore, I do think that, as you get farther up the rank levels, you should be required to teach, at least to the extent described (having individual students, and having at least 1 travel from white belt to black belt with you as an instructor) - how else can you be a master instructor, if you've never been an instructor? But that's just my opinion.
To answer the other point that came up through this thread, I know plenty of students who would not be able to teach an independent class at I Dan, although they are certainly able to assist or teach smaller groups - some because they are not able to explain, and some because they don't THINK they are able to explain (some correctly, and some not). I do think that all black belt students should help with the class, and there are quite a few ways they can do it - but I also know of an instructor who was promoted to VII Dan (which is Master Instructor in the ITF) without ever being an independent instructor - said person taught in other peoples' schools on a regular but not always predictable schedule, and never had personal students (that is, students who consider said person to be their own instructor), and certainly never took a student from white belt to black belt - at that point, HOW can you be a Master Instructor if you've never been a student's instructor? Therefore, I do think that, as you get farther up the rank levels, you should be required to teach, at least to the extent described (having individual students, and having at least 1 travel from white belt to black belt with you as an instructor) - how else can you be a master instructor, if you've never been an instructor? But that's just my opinion.