Sahsah, nudists must have this trouble all the time!
What I do when out for dinner is ask our waitress/waiter if I may vape. They go to ask manager, and come back to say I can't because other customers may think I'm smoking. I understand and thank them for their effort. Then I set on the table my prettiest, decked out mod with my sparkliest drip tip right where everyone can see it.
I don't vape......just let it sit there in the hopes someone will ask me what it is and how it works, etc. I would love for anyone to stop by. Granny and Grandpaw proceed to have a good time having our tasty dinner. I figure the more people ask, even tho more than likely you'll be turned down, the more the managers and owners realize how fast vaping is growing or even become aware of it and more knowledgeable. I do this in as friendly, non threatening way as I can so that other customers will see that pretty or handsome vaping gear is definitely NOT a cigarette and belongs to this short, white haired, glasses wearing grandma. Maybe they'll become curious and start looking into vaping for a friend or family member or even themselves.....never know.