It's been a crime for years and the police don't seem to have been able to stamp it out. Gosh, it's almost as if they can't be everywhere at once and that citizens will have to take some responsibility themselves for what constitutes acceptable social behaviour. Writing about it on blogs and news aggregates and raising awareness is the only way the problem will get solved.

Or a lawyer. Especially if there's documentation involved. Making a private, nasty situation for the jerk who did this (and possibly a settlement) could probably deter future behavior, at least for this one person.

Is it illegal ban somebody from a conference for personal reasons?