I have vaped, and will continue to vape, everywhere.
The closest I've had to negative reactions are:
1) a gas station employee who playfully gives me a hard time every time I walk in vaping (he tells me I can't smoke in here), but he's even told other customers in line what I was doing and (if they were buying cigs) that they should ask me more about it. When I don't have it he asks me where 'my thing' is at and why I don't have it.
2) Meeting my local supplier, at a bar he frequently uses as a meet place for local buyers, he had my credit card and there were 2-3 bottles of ejuice sitting out. The owner came over and asked what we were doing and told us we had to put the juice up because it looked like we were dealing drugs.
I used to ask at restaurants, but rarely do anymore. If anybody asks me to stop, or tells me there is no smoking, I explain it's a personal inhaler, similar to what asthmatics use, that delivers nicotine to me and water vapor into the air. A business owner/manager does have every right to ask me to leave, for any reason, anytime they choose, whether I'm vaping or being loud or sitting there minding my own business and they just don't like the way I look. That is their right, if they don't want me as a customer. If an owner/manager ever asked me to stop after I explained what it was, I would then leave instead (assuming I'm not in the middle of food I've already paid for), explaining on my way out (and probably very loudly) how upset I was, how the vaping community is growing, and that I will be giving them negative reviews anywhere/everywhere I can find to post them.
Most people I've met were aware of it from the radio ads and mall kiosks and such and are just more curious about how it works (both mechanically and as a smoking cessation device). Even most militant anti-smokers I've run into are curious about it (some happy to see another long-time smoker quit, makes them feel like their movement made a difference), and many have friends or relatives they would like to give a safer option.