How Do You Deal With Negative People?

This post is completely random and un-book related, but it's something I want to talk about and get off my chest. And I also want to hear from you guys and get your advice. To start this off, you should know that I'm a very positive person. I'm happy. I smile a lot. Not a lot gets me down and not a lot of people can push my buttons. So when somebody gets to me, it's got to be pretty bad right? And being a positive person, makes being around negative people exhausting to me. I literally feel drained after spending hours of my day with them. It's not even anything they're doing to me specifically. It's just the environment they create. I can feel the negativity sitting in the air. 

Not only am I positive person, I'm also a very strong extrovert. Which means that I need, yes literally need, to talk to people throughout my day or I become lethargic and crabby. [Sidenote: At work we went through MBTI testing and found out our types and learned all about this. Super interesting stuff. I'm an ENFJ if you're wondering.] So when I'm surrounded by negative people, I don't talk to said people and then I'm left feeling drained and exhausted a). because I've been in a negative environment all day and b). because I haven't spoken to anyone all day. 

When put in negative environments, I've tried listening to music, moving around as much as possible and discussing my issues with whoever the culprit is. But none of this has really seemed to help. The music is probably the best, but then I start to feel drained because I haven't spoken to anyone all day. Doiuble-edged sword here, people. 

And do you know what sucks the most about this? When you genuinely like whatever you're doing/wherever you are, but the negativity is making you dread it. It amazes me how much your environment can impact your general happiness and enjoyment of things. That's why people constantly preach at you to surround yourself with positive people. Because their smiles will put a smile on your face. Their positive attitudes will rub off on you. And isn't life better when you're happy and smiling? 

But of course, you can't always avoid negative people or environments. So what do you do when you're forced to deal with it on a regular basis? What do you do to combat negativity? How do you not let it get you down? How do you stay in positive spirits when the people around you are negative?