If I was sitting at the bar with friends I probably wouldn't have bothered to, either. I was in the restaurant area with my family surrounded by other families.
I generally don't ask in bars.
While we may feel like it's no different than chewing gum, we *are* putting a visible vapor out into the air and I don't believe that pretending we have more rights than everyone else sitting around is going to help the cause in the long run. Yes, it is absolutely "better" than cigarette smoke, by far, but it's still *there*.
Well it's fairly easy to say that vaping is not pretending we have more rights than everyone else sitting around us. There are people sitting around us playing with noisy cell phones or wearing mismatched outfits, or all manner of objectionable things. vaping is no better or worse. So, it's not more rights. It's the same rights. It's polite to ask to avoid a misunderstanding and I usually do in a restaurant but, to say you are assuming more rights than anyone else if you don't, is going a little far.