I don't think I've ever gotten a shocked look when I pull out my 3DS, but I've definitely gotten looks. I look younger than I actually am though, (I'm 20) so I guess it's not really a surprise to people.
So I am just curious if anyone you passed on the street would think you are:
a) A Gamer?
I'm not sure what people expect when they see me. I don't think it really surprises anyone, I'm a 33 year old goth chick with hair past my waist, I get judged anyway. When I tell people like coworkers (I do accounting and IT) I am a gamer, they are positive and curious, even the guys. I've gotten more shocked looks and teasing for having a black belt in kung fu than for the gaming hobby.
b) Would be carrying your 3DS to street pass?
My SO teased me until we went to a retro gaming convention and I got like 45 streetpasses at once. He thought the connectivity was pretty cool after that. I've had to explain what it is and what I'm playing when on the train or at the airport, but given the fact everyone plays angry birds on their smart phone, the 3ds isn't that weird anymore.
c) Would be playing AC:NL?
I'm a girl, it is categorized as a girly game. So yeah, people expect if a girl is gaming she's playing peggle, sims, that fashion game on 3ds or animal crossing. Sad, but that is the way the world is right now, it's still a 'boys hobby' according to the mainstream. I play a mud, WOW, JRPGS and console games, those that know me realize I play a bit of everything so it's not a surprise.
People who have no connection to videogames whatsoever probably won't expect me to be playing them - that includes collegues who are my age. People, however, who do know videogames and stuff, will probably guess that I might enjoy gaming, too. I think most people don't care at all, though.
Actually, when I pull out a portable gaming device or even a doll or other toy (because I collect & like to play with them), it's the children who are staring in total surprise. They remind me that I'm actually a grown-up now