One thing that makes my blood boil, and I've seen it in many countries I've lived in, is that people who vape tend to see it as being fine to vape e.g. on trains. Here in Germany people are vaping in the trains nonstop, and while it's not as bad as people dropping cigarette butts on the street (usually literally directly next to a bin!), it still makes it difficult to respect the group, given how shockingly common it is.