So, what I'm basically saying is that soap spreads on the surface of the water due to the fact that it has both polar and nonpolar poles. This pushes the pepper to the edges. Observe below:
So yeah soap is repulsive to pepper. When it's just water and soap, the soap gently floats to the bottom of the cup and then mixes in of sorts.
The yellow tint around the edges is the soap.
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