Depends on whether the confetti is thin enough to stay in the boundry layer of air rotating at the surface of the top and on the coefficient of friction between top and confetti reletive to the centrifugal force and the boundry layer pressure coefficient. In zero g the confetti would have a harder time penetrating the boundry layer without gravity to help. While the boundry layer would pull on it the centrifugal force to friction ratio is higher in the air away from the surface than with confetti in direct contact with the solid surface. It would be flung away from the top before it contacts. Unless it approaches near the center of rotation.
Good to see you broadening your intrests.