Spoken up, or, much more easily and effectively, given the perpetrator nasty looks, not have invited him around the next time, gossipped about him behind his ba

Spoken up, or, much more easily and effectively, given the perpetrator nasty looks, not have invited him around the next time, gossipped about him behind his back or whatever else is part of the usual creep treatment. For all the reluctance tech people might have to consciously engage in this sort of herd animal behaviour, it's a component of social interaction that isn't going anywhere anytime soon; if they refuse to deliberately use it in situations to an end they can agree to be good, it will just wind up being used to random ends in ways the people doing it are not even aware of. In addition, this way, the pressure of having to "start a fuss" by lifting something unspoken into the realm of explicit discourse if they don't want a situation that is unpleasant to themselves to continue will be on the people who were at fault to begin with.