I don't know what the answer is to this, but I would hope we can figure it out soon.
I don't have a good answer, but I'm certain that it's not:
a) putting on the annoyed face, or
b) ignoring the person trying to be nice to you, or
c) waving your hands frantically.
If things are iffy, I:
1) stop, and jump off my bike (just feet to the ground)
2) point purposefully at the driver whose turn it is to go
3) wait for them to go and for others to take their turn
4) then i go on my turn.
