The vapor from a PV is not toxic waste and quite frankly extends no further than your breath. All the vapor does is make the locations where your breath is going more visible.
I am all for being polite, but I don't think in general it is healthy to take an attitude that what we are doing should be hidden or is somehow any more hazardous to the people around us than breathing.
Vaping isn't breathing, though. Vaping may be safer than smoking, but that doesn't mean it's 100% harmless. My husband is glad I quit smoking, and loves that I vape and encourages it. However, I can't vape in a small, enclosed area or while snuggling up to him because it irritates his eyes and throat. He didn't admit this to me until after I asked him if the vapor ever bothered him. He didn't want to say anything because he was so glad I wasn't smoking. But once I found out the truth, I became much more courteous with my vapor around him.
There are plenty of people on this forum who do either 100% PG or 100% VG because they discovered one or the other was causing mild reactions like extra phlegm or irritation or other issues.
Common sense dictates vaping is much more healthy than smoking, but it's stretching things a bit far to say it's not going to harm anyone in any way.
It's not a shame issue, it's a courtesy issue. Like I said before, I wouldn't wander around with a mini fog machine in everyone's face. Just because we can theoretically do it anywhere doesn't mean we should.
Also, I am addicted to nicotine. If I wasn't, I wouldn't vape. I know others out there use 0 nic. Personally, I don't think I could do that. Nicotine may not be doing me much harm or hurting others, but why should I be proud of the fact that a chemical has some control over me? I'm happy I switched, and I tell people very positive things about vaping, but ultimately I vape to satisfy a drug addiction. This is my experience. I know others on this forum have said they aren't addicted to nicotine and I know there are those out there who simply enjoy the action of vaping without nicotine liquid.
I also understand that the media has said some negative things and the FDA and government want their share of the pie and thus are creating a lot of worry for those of us who vape. But I think it's a bit extreme to sit next to a stranger on a bench and say " This can't harm you and if you don't like the smell or the sight, too bad, " and blow clouds of vapor in their face.
Again, imagine yourself carrying a mini-fog machine around. Or, hell, a water gun. Nothing comes out of a water gun but water, which causes no harm, but that doesn't make it right to run around town getting people wet.
I may be against popular vaper opinion on this, but I don't think it's ok to invade other people's personal space with vapor or water or perfume or even bad breath. It's just bad manners and not likely to win many people over.