Originally Posted by
trek2.3bike
Stop pointing because it is not part of the stanrard left turn signal. You are confusing them.
Personally, I find it hard to believe that this is widespread. Although I admit that the direct response of the driver points to that very explanation. In part because I point and have not experienced this (or have not noticed ...). Barring the @sshole theory, I think incorporating a little more body language, in particular a head turn sends more information. YMMV.