The White House an "It's On Us" campaign right now. It's a great
  idea, but alas, it preaches to the converted.

  Sociopathic humor like the frat-boy signs will continue, perhaps
  subverted and as [1]Chuck Hambleton points out, subverting it
  and making it underground might prove to be worse.

  At the same time, does it *REALLY* have to be so explicit on a
  kid's FIRST DAY AT UNIVERSITY? Just BEING at the University and
  making friends, you'd figure out the culture soon enough. I
  agree that the the behavior shouldn't be condoned by the
  community. Still... criminalizing the signs won't stop the
  mentality behind it... and that can be a little more
  frightening. Every man becomes a potential frat boy in nice-guy
  clothing.

  So, like most things, a decent answer to the problem has many
  difficult levels.

References

  Visible links
  1. https://www.facebook.com/chuck.hambleton?hc_location=ufi