We heard about how Lady Gaga suffered from internet bullies after her Super Bowl appearance. There is nothing biblical about attacking people via protection of anonymity. The Bible verse ‘remove the beams from your own eyes ‘ comes to mind as does ‘do not judge’. Attacking people hiding behind the keyboard is not Christian and it is most likely sin and God does not give permission to his followers to sin, even if you do not like the person or the way they look.
God wants his followers to be obedient even when their identity is protected. What you think may be the right thing to do is probably not as you need to check to see where your thoughts are coming from and if they would be approved of God. There are many passages of scripture that will guide you in this,including the ones from the epistles of peter which says to add spiritual virtues to other existing spiritual virtues.
Living the Christian life is done at all times, not when we are in public and people will know who we are.