WHAT A PAIN

Before I go to bed, here's something I was thinkin' about in the shower:

Internet, how often do you find someone's typing habits affecting your opinion of them? I mean, there's the obvious ones where if someone speaks in near-incomprehensible chatspeak and fangirl Japanese or whatever then you avoid them like the plague, but what about smaller things like, say, what smilies they use, or whether they type in all lowercase, or if they "roleplay" while chatting (*grins*, *laughs*, *nods*, etc), or if they keyboard mash a lot.

For example, say someone used perfect grammar and never used smilies or caps or anything like that, and everything they wrote always seemed calm and thought-out. Would you think that person was intelligent, or would you think they were arrogant or unapproachable? What if someone else were to (in essence) say the exact same things that person said, only with a less serious typing style (caps, sarcastic italics/bolding, whatever). Would you think they were smarter or easier to talk to than the other person? What other quirks have an effect on you?

I'd offer my thoughts, but I don't wanna risk coloring someone else's opinion or anything, so I'll wait :V LET ME KNOW, I'VE BEEN THINKING ABOUT THIS A LOT FOR SOME REASON

Edit: Oh yeah, and what about you? Are there certain smilies you refuse to use because you feel they give off a certain impression, or anything like that? IF SO, THROW THAT IN TOO