Tom Donaly wrote:
Tell me which of the water molecules moved in two opposite directions
at the same time. The waves can move through each other in opposite
directions, but their combined influence is what moves the water
molecules. There are not two separate sets of water molecules that
flow in opposite directions, either. It's the combined total of
forces that causes the movement of both charge and water. Two opposite
movements of either charge or water are impossible.

Nobody is arguing about that so it is obviously just a straw man.
The real question is: Can two EM waves travel in opposite directions
in free space or along a wire. The answer is YES!!! Standing waves
can exist in free space or along a wire. To deny the existence of
standing waves is ridiculous.
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73, Cecil http://www.qsl.net/w5dxp