TBH I don't think either bit-tipsy or the rohypnol are acceptable, especially from a public figure. It's all part of degrading women, and the idea it's OK to trick them into sexualised contact with you, theoretical, joking or otherwise.
The most common spiking agent IS alcohol. Either alcohol in an ostensibly non-alcoholic drink, or more alcohol than the recipient realises. I've had that done to me more than once.
In the bin with not-so-Cleverly and everyone like him.