It was done to stir it, obviously, and to keep himself in the limelight.
If it were possible to say to any demographic group, "You voted the wrong way, so you can't vote any more," then over time ALL voters would be disenfranchised by successive waves of governments in power. Dictators and totalitarian regimes would love that. Once in, they could make sure they were never voted out again.
When a political leader lies on their CV - can you trust them?
