Would waiting 24 hours really have damaged your vacation? If you would have missed a cruise departure I can understand but if not I'd take the night in Singapore and let your son recoup. As a child I used to get vicious motion sickness attacks and know how much it can suck.
Also I think the man waving his hands was just a Ft member EightBlack when they told him they wouldn't open another bottle of Dom until after takeoff.