No, don't be afraid. In fact, *he* is the one out of line here, even by WTS standards.
Kick him all you want, he won't be holding long his position since: (a) he takes double time (2h) to complete the lesson, (b) he insults brothers in the audience, (c) he comments too much on the lesson, instead of letting the audience do the most commenting, (d) he instructs the audience with arbitrary rules as to how they should prepare for the study.
All those 4 reasons are legitimate causes for him to be relieved of his assignment. If you are in good terms with an elder of his congo, shoot freely.