You are confusing a low voltage battery with the inductive kick given by loads. But that also happens on the +ve side (thanks to duality or symmetry or whatever it's called).
However I suspect you are also talking about holding a connector whilst disconnecting it - eg, the +ve or -ve battery terminal. You won't get a kick by connecting yourself in series with the battery - unless perhaps you have another power source present (another battery powering the circuits, or a welder, etc). But hold across connectors when (relay) coils de-energise etc and yes, you'll get a nice kick.
And welders work on current. What your saying is like saying that because a battery can melt a screwdriver, it can electrocute you or give you kick.
As to non-symmetry because "electrons from the -ve terminal", that is plain wrong (not to mention the crap about current flow being merely "electron movement").