Toxic people are parasites. They distract us from our positive or productive habits. They'll be the ones that discourage us from exercise or make fun of us for working on improving ourselves. They'll come up with reasons for you to stay in other bad relationships. Toxic people get you stuck in the past and focused on the negative. In that mentality, you can't move forward and you can't succeed. It is impossible for them to share in your joy, and they just plain sap your energy, leaving you drained after every self-absorbed, narcissistic conversation they have with you.