In the social media, it is seen more and more that abuse and personal vilification are made when one is not able to defend his/her argument effectively and to the point. I feel it is part of defeated mentality. Either it can be ignored with disdain and contempt it deserves or tit-for-tat can be given or convince the person once again that his argument is weak and is to be changed. My preference is for the first option, since I do not want to hurt or humiliate the concerned person. I consider it as his weakness which is to be excused. I do not want to go down to his/her position.