I vape wherever I want, but very discretely so as not to provoke anyone and not when anyone is within vapour distance. I've stopped asking permission 'cause every time I do, I'm told no. Many see it but so far nobody has challenged me about it, and only 1 person expressed interest. The standard response from smokers that I suggest vaping to is "tried it, don't like it."
So I just do my own thing.