Where you beg to differ is where I chose to swat it aside and get it over with.
"You don't like the smell? Fine, sorry about that, let me move downwind" and I just keep on trucking. They will usually not stick around to see what you do either, so I just put my vape away, and when they're gone (5 seconds) I pull it out again like nothing happened. I can let that slide easily, we don't know eachother, that person means nothing to me.
I look around before pulling out my vape to see if the wind is going to carry it directly in someone else's face. The wind is my main parameter since I only vape outside in public. If I pull out my vape, it's because I can do it with respect.
Someone who complains about the smell or whether I'm a fruit jam inhaling protozombie looking to spread his disease only wants to hear "Okay" and move on with a confidence they experience only sporadically. They don't care whether it's safe or not, that's not why they're all up in your face, so why bring it up?
"Don't blow that .... in my face, son"
"But sir, it's safe, it's not smoke"
And then the discussion has to go further and I just don't care, that person is just looking for a confrontation and means nothing to me. I'm not going to bring up the safety of second hand vape or tell them to google "Peering through the mist". It's litteraly 10 second of my day where someone I don't know thinks he knows better than me. Let him have his moment, as soon as he turns his back I'm already at it again anyway.
I just keep my patience for people who want to know. I will wish a nice day to the others and just let them move out of the way.
I absolutely love breaking down and explaining things to people who care. I've been a teacher in the past and miss it very much. The others well....I'm a busy guy!