Sana is creating a nexus of anti-PTI journalists who got some nasty messages from who knows who. And the nexus is trying to cash in on the matter. Unfortunately these biased journalists deliberatly fail to realize the current culture and situation of the youth. It is off course wrong to use bad language but that is what internet culture is. Why blame PTI for this? Specially when they know it could only hurt PTI.
Arif Alvi was quite right, PTI condems it and can only advise people at large not to do such things but they cannot control behavior of people. It may even be done by enemies of the PTI, quite possible.
I would also warn all PTI supporters please be use appropriate language. No need to get nasty or vulgar it would only hurt your cause and give ammunition to your opponents.