Although it’s not immediately apparent, constant negativity is actually quite toxic behavior to both the person doing it and the people around them. Not only are negative and pessimistic thoughts detrimental to one’s own confidence and self-esteem, but it’s extremely draining to others who have to be subjected to the constant negativity. This lack of positivity puts a damper on everything, as a very negative person will also react to other people’s good news with condescension or skepticism.