Why do so many drivers who are trying to be "nice" and hold up traffic to let me turn into their lane, for example, get
really fucking angry if I miss their proffered generosity? I've had two or three people in just the last few days throw up their hands and make rude gestures and seem otherwise completely aggrieved that I did not allow them to be nice
→[More:] which seems to be rather missing the point of being nice.
I wasn't purposely ignoring them, either, it's just that one kind of tends to tune out a bit when one assumes that one will be waiting for quite a bit until the traffic thins out to be able to turn.