He's taking it to extremes but there is a grain of truth there.

On the off chance that utterly unfounded accusations are made, and there's no witnesses or surveillance video, YOU are utterly screwed job and career wise. YOU have to provide the exculpatory evidence IMMEDIATELY or walk the plank.

Probably won't ever happen to you, but if it does you won't know what hit you. I didn't really believe it either until I saw it happen.

We're in an unusual employment situation because...

1) Pilots/crew do have a bit of legendary rep from days gone by.
2) We CONSTANTLY are with co-workers in an environment with bedrooms and booze.

The public/media/jurors are more likely to assume accusations are credible if the venue was a bar and/or hotel room, vice the cubicle farm at a white-collar gig.