I guess where you draw the line at safety is your choice. I draw the line at any of the following: using your phone/texting, running a red light, changing lanes without looking or without leaving proper space, hard braking and near misses, aggressive tailgating, consistently missing turns/traffic signs/etc, aggressive speeding (+15mph more than the flow of traffic), not yielding to pedestrians, yelling at other drivers and/or losing your cool while driving.

Regarding you comment: I do it every time - I also indicate in the review what was wrong. If you can barely drive you should not drive anyone around. Sorry.