There's a possiblity that you're just a more capable student than "Reagan" and he/she is saying he/she is only spending 1-2 hours per week because of being shy about admitting understanding less than you. I could be wrong, but if I'm not wrong, it would be an opportunity for you to start teaching someone something substantial. Anyway, if you enlighten someone, it doesn't mean your own knowledge gets decreased in the process. And no matter how lazy or hopeless a student is, isn't it worse to have them not to be there at all, than to have them being there and trying to follow what you explain to them? Yeah, it's lonely at the top, but it's even more lonely if you kick the fingers of those hanging on beneath your feet, and they fall, right?
I mean, if you end up in a position of leadership in a seminar in a couple of years, are you going to be challenging the ones at the back, "YOU. OUT! You know nothing!"
I'm tempted to tell a story about a homeless guy who would come to particular seminars in NY city in the early 1980's. He would sit in the back row and fall asleep within 1 minute, and snore the whole time, and somehow wake up again towards the end of the hour. The only thing he ever said was, when a lecturer mentioned that the complex plane (with one of i or -i labelled) has a natural orientation, this man woke up and shouted "Counter Clock-wise!" and fell asleep again.