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> that repulsive force will, by definition, move the negative mass further toward you.

only if the repulsive force is negative gravity.

If a positive-mass electron attracts a negative-mass electron, the repulsive electromagnetic force will still keep them from making it all the way there.

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>> that repulsive force will, by definition, move the negative mass further toward you.

> only if the repulsive force is negative gravity

We're talking about negative inertial mass, not negative gravitational mass. Negative inertial mass means accelerating against the direction of any force applied to you, including but not limited to gravity.

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