Toxic people are people that cause your life to be miserable and the toxic person could be someone you thought was your friend.
Toxic people can be bullies or someone that just wants to torment you as well.
When someone or some people are being toxic to you and making your life miserable you need to tell them straight up and sternly that you don't appreciate what they are doing and that they need to stay out of your life.
It's best to avoid those toxic people and move on with your life but if the toxic person gets too bad and doesn't leave you alone or you feel threatened then you need to get a restraining order to legally force them to stay away from you.
Some signs of a Toxic person are.
They overshare, They Talk bad about you behind your back, They make fun of you, They Taunt You, give backhanded compliments, they are easily jealous, they try to intimidate you, they try control you by guilt tripping you.
Another sign of a toxic person is that when you're around the toxic person you are left feeling emotionally exhausted after an encounter with them.
A Toxic person is not worth your time and they will usually not change their ways.