Have you ever met someone that's 100% negative?

Have you ever met someone that's completely negative all the time? No
matter what the subject is, he has to point out the worst possibility
or twist things around so he can rant about something unbearably
horrible.

Some people wear rose-colored glasses, but this guy's glasses are
black and barely let a sliver of light through. And it makes him feel
the best to share the misery, especially with people that are having a
good time. He likes to wreck the mood and turn smiles upside down
wherever he goes. It's his one party trick.

Maybe he's depressed. Unfortunately, any suggestion that he seek
professional help is met with verbal and sometimes physical
aggression. It's sad and uncomfortable, but he refuses to be helped.