> OK, in a theoretical world where meetings aren't hours long with no agenda and tons of circular, pointless discussion, I agree.
Well, an agenda is part of the courtesy the meeting convener owes the participants, and a well-run meeting is part of the courtesy the chairman owes the participants.
Meetings are incredibly expensive: everyone owes it to their organisation, one another and themselves to make that expense worth it.
If you shouldn't be in the meeting, leave. If you should be, stay. If the meeting should be split up, then advocate for it to be split up. If it should be structured differently, then advocate for it to be structured differently.
> Yeah, that would be nice, but I'm not going to change the world just by thinking so.
Then take action! You are not a passive victim of circumstances: you are an active participant in, among other things, meetings; demand that your fellow-participants behave politely.