Well it would work for me like it would for anyone else: by accelerating them at 15ft per second per second.
Gravity works like the rest of Natural Law - it works the same regardless of the mental "trust" state of anyone who abominates it.
I would say that gravity always "works" because it does not require the cooperation of the falling object; but bare unprepared "truth-telling" doesn't always work, because it DOES require the cooperation of the hearer.
If the transmitter is working, but the receiver isn't, the broadcast is a fail.