As first described here by Alicia, and then in DWD as pointed out by O-Dub, if anything ought to trouble folks it's not the exposure of the breast, but how we were expected to be titillated by what basically amounted to Justin portraying a sexual predator, with Janet as his victim. Given that context, it's especially disturbing that she is taking the brunt of the blame while he gets a free ride, so far.
As far as Justin goes (and for the record I have been championing him for years), if he is any type of man he will bow out of the grammies in solidarity. But so far he seems too wrapped up in his own victimhood, practically sounding like he thinks Janet victimized him. Not very smooth, homey.