However, my oppinion is about something objective: the value of private lessons coupled with (not in opposition to) group classes. Keep in mind that an argument, ANY argument, is necessarily subjective, statements and support of the statements themselves determine validity, not the source. In any event, volumns have been written on informal fallacies, and I don't need to personally shoot down the curcumstantial ad hominim as fallacious.
But again, it's not in the academy that I decided private lessons with group lessons were a better training model. I can set up further examples from music, mathematics, science, etc. that support my claim. And I did, when I was deciding if I wanted to pay $185 a month to take private lessons. (I was used to paying $35). When it comes down to it, people learn the same no matter the subject. They learn from being in a group and they learn one on one. And they learn faster and more fully when doing both. That's why colleges pay for on campus tutors to be available for their students. That's why there's a whole tutoring industry, for that matter. That's how people can make a living teaching musical instruments or as voice coaches. Give me a month, and I'll write a full paper on it. Heck I'll probably do it anyway.
Don't base your argument on one piece of evidence: the fact that I'm a red belt. Other than putting the cart before the horse and trying somehow to defy logic to make a fallacy valid, your argment is too narrow in scope. You have no idea what my experience is, or what my degree is in. I could have a GED or a doctorate in Education, and you don't know(just so you know: neither). But you decided my oppinion on private lessons-- and for some reason, only private lessons, though I am arguing for the "private and group" category-- based on my involvement in the USSD instructors, and I would assume based on previous comments you've made based on my involvement in USSD.
If you're going to make a counter-argument to my take on private instruction in conjunction with group classes my suggestion is you broaden your scope.