Secondly, re-evaluate your stand, actions or words. If you are acting authentically from a place of doing the best that you can it is then best to ignore any criticism. When people are being critical, seemingly without reason or certainly without giving you any benefit of the doubt or reasonably trying to discourse with you, then, it is wise to just no engage your critics. Some people do have a need to fuel controversy and conflict for the sake of it and for the high that it gives them. With these people there is no reasoning.
Negative energy is a very powerful thing.
Negative begets negative which begets negative. Choose to live your life in the positive. Criticism can be constructive. There is much to be learned from constructive criticism that is put forth in a responsible and caring way. Be kind and gentle to yourself.