I would absolutely expel someone from my dojo who was a disruption because of their own faults. When we are training we are training not catching our breathe, when coming in to practice bathe your self and brush your teeth and trim your finger nails and keep a clean uniform. I expect an effort and and apology when expectations aren't met. However I am very stubborn and probably a little off my nut.
Your dojo, your rules. As long as you're equal-opportunity in your discrimination, I don't think anyone can say that you're being unfairly