Of course, we might want to dig deeper on that question. OK, so teaching an uninterested group of people does affect the teacher - why are those people uninterested in the first place? If they are uninterested, do they have the option to not attend?
So one aspect is that it's similar to how people,were disinterested in classes earlier, but with a slight bump because of the stronger engagement to games designed to be skinner boxes, or the impact of constant engagement.
But I'll Assume that it's still only a minor effect.
The part which would bug me is someone using a laptop or device to visibly do something else in class- because it's just far more visible and distracting.