I don't think it's as black and white as are we the good guys or the bad guys. There are people who disapprove of it because they're uninformed, or more likely have been misinformed by the media. And also as others have said, because the only vapers they notice are the ones making massive clouds on the street that are so dense people have to walk through it - that's inconsiderate and it's a shame because they're the vapers who stand out the most.
And then there's also people who are interested - I vape in the smoking shelter at work and people, strangers, often show interest and ask questions. And
vaping in the UK is very common to see on the streets, but they're usually MTL devices or maybe DTL ones used on a low wattage.
My wife is a good example of someone who has a grey area perception of vaping. She's glad I don't smoke but doesn't really approve of vaping per se; she's glad I've chosen a harm reduction path, but would probably prefer it if if I stopped my nicotine habit altogether. I don't argue,, I see her point of view and just make sure I'm considerate, ie not doing it around her unless we've gone to the pub.
I think the attitudes you get about your vaping depends on the country you live in. In the UK, and I think Europe in general, despite the TPD regulations, it seems more of an acceptable thing than in the US where it's become some sort of moral panic.
My guess is that in another generation of not sooner vaping will either become normalised and accepted unless they find solid evidence that proves definitively there is long-term severe damage to the body from vaping. Personally I think that's unlikely but who knows, people probably thought the same about smoking once upon a time