I'd agree with realistically positive. Some of the worst things can happen and often I'll just shrug them away with a simple "that's the way it goes". However, I also think things out a bit logically, too, so I don't get my hopes up for things that just aren't probable gievn the circumstances.
Honestly, what's the point in even being negative? I agree with Shining Raichu in that shtick does get old fast, and that people will be more drawn to you if you're positive than otherwise. At least in real life. I'm sure you can find lots of places online that welcome misery. Well, I guess you can find those iRL too, but I'd think you'd feel dirtier afterward. ;P