^ Sorry to cut in...but I really don't think, in this case, that it's because it's offensive to people (though I'm not saying vaping in general isn't offensive to people, and for silly reasons which, yes, can and should be addressed, and often).
I think it's because, especially through all those clouds of vapor, in the dark, with pushing, shoving and rabid clowns jumping out at you with chainless chainsaws and drunk people screaming and crashing into one another, it's very very hard to tell a cig from a vape...and one actual cig will ignite that entire place in minutes. And if you're smoking in line next to that big structure with the screaming clowns and darkness and drunk people, indeed especially if you are one of those drunk people, which has a certain percentage of likelihood, you might just flick that ciggie wherever and...boom. In light of that, just exactly how much time and policing capability do you imagine these workers have to determine "oh, wait, I think I can see squinting through the clouds that this probably isn't an actual lit device"?
Wandering around in the open, not on line next to the attraction with your nose in another person's back and the person behind you crunching up to your backside as if it will get him to the attraction quicker is obviously much different, and probably way less of a hazard overall, just using common sense.
And beyond you just innocently vaping, any smoker might see a cig-looking thing in someone's mouth with "smoky" looking stuff coming out of it, think, "Oh, okay! It's okay to smoke right here next to the attraction" and light up. As a former smoker, I probably would have. Add alcohol? Oh well then I *absolutely* would have. And not in a very coordinated way, at that. So now you have a whole bunch of overexcited, buzzed people with lit cigs in their hands that the "narcs" have to rush over to police...not good. I sure as hell wouldn't want to have to deal with that as a worker.
So rather than grappling with squinting through the fog and .... all over the place to inspect whether something is a vape or a cig (THEY DO LOOK ALIKE, I am sorry), it's just "no, now move on." Can you blame them? Too much trouble, too hard to see, too hard to enforce person-by-person inching along in a line...next to something that could be very dangerous if it went up. Lawsuit.
I really think that's the issue here...in this case.
In the case of standing in line for the Teacups at high noon, I'd think it would be a different story. But this is this story...and I can really, really see the "narcs'" side to this one.
Not every single request for someone not to vape is an indictment against the stupidity regarding e-cigs.