Hearing negative words, sentences, complaints -about everything, makes me so irritated. It is as if I am?

allergic to anything that is bad and negative. I want people to chit-chat with me and talk positive also talk about nice things, but people around me, my parents etc., their mouths are so dirty and negative. I do my best to be a good person and have a positive mind and i talk nicely. They dirty, esp. my mother, my soul and aura with their negative words about other people etc. She is so touchy so I cant say her not to talk. She is draining my energy and making me feel ill and extremely stressful every day. What should I do?