People that are negative all the time

[Popinjay]

I have a friend. He is very overweight, stays in his room most of the time, plays a lot of video games, and is seemingly negative ALL the time. When I say negative I mean saying things like, That's [censored] dumb, Shut up bitch, etc. etc. It is starting to piss me off. How do you change or deal with a guy like this besides abandoning friendship?