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That is a misconception The Coriolis effect is too weak to overcome the forces in action.
The Coriolis force still affects the direction of the flow of water, but only minutely. Only if the water is so still that the effective rotation rate of the Earth is faster than that of the water relative to its container, and if externally applied torques (such as might be caused by flow over an uneven bottom surface or spin of a bottle) are small enough, the Coriolis effect may indeed determine the direction of the vortex. Without such careful preparation, the Coriolis effect is likely to be much smaller than various other influences on drain direction such as any residual rotation of the water and the geometry of the container.
In summery the toilets spin the same way north and south of the equator.
It’s Called Wasting Water!