I'm a noob, one week vaping... so I tried it in a local restaurant/bar here for the first time (one that doesn't allow smoking).
I didn't know the bartender when I first walked in, so I kinda "stealth vaped" at first... it's a place near me, where I usually stop for a drink or 3 before heading across the parking lot to the Mega-Multi-Google-plex theater. Shifts changed, and a bartender I've known for a while came on...
We shook hands, said the usual "hi's"... and I asked him, "hey, you mind if I vape?". He didn't bat an eylid. "Yeah, man, that's cool... someone else was in here last week with one of those." (gotta find this person, lol. BTW, if you're in West Monroe, Louisiana, it's the El Chico by I-20).
So I showed him the parts, how it worked, etc. He asked about the flavors, like "can it be any flavor of tobacco you want?" I said, "It can be just about any FLAVOR you want... cherry, bourbon, chocolate, tobacco, hell even 'Kung Pao Chicken' and 'Roast Beef'. There's no rule that says it HAS to taste like tobacco at all! Wanna try my black licorice?" He said he didn't smoke, but his mom did, and he's thinking of getting her to try one just for health reasons. Told him about the many, many pro's and very few con's of vaping, Very cool conversation. I openly vaped without any hassle after that, and even got a few nice questions from other patrons. Very positive experience for my first time openly vaping in a "non-smoking" area.
I guess it's just a matter of not being a jerk about it.... talk to ppl, they'll be receptive generally. Or be super, super discreet. [at first, the owner was staring, I swear STARING at me... but since I held it in until the vape wasn't visible when I exhaled, and palmed my DS-103 so the LED was hidden and you couldn't really tell what I had in my hand, even he didn't say anything].