Sidestepping the "stealth" aspect for a minute, would you openly vape in your friend's house if your friend stated she would like you not to? How about if your friend owned a coffee shop and requested you don't vape in her shop? Would you still vape? So what's the difference when it's the establishment of someone you don't know? They're a stranger so you aren't going to let them step on your rights? Your argument to me reeks of self-important righteousness in the face of being respectful of other people.
All these stories on here about that jerk security guard/bar owner etc giving someone a hard time about their vape? What if I told you that the day before you walked into their establishment, someone else tried to vape and became annoyingly indignant and entitled when the owner politely asked him to stop? Would you blame the owner for being a little more direct and unwilling to listen now to your vaping story? Some of the attitudes on here- while I realize and hope are not representative of general vaping population- make me dislike vapers, and I vape!
Linden does bring up a very good point, though, about vapers purposefully maintaining the link between themselves and smokers. I think her pride (or "self-important righteousness") stems from the fact that she's consciously making an effort to break that connection.
You're right in that we vapers should be more mindful of how we handle ourselves in certain places. I understand that flagrant disrespect towards people either ignorant about vaping or who are simply following the rules and doing their jobs is completely out of line, but perhaps such times present great opportunities to educate on vaping. In any case, vapers should be upset--one of the best, healthiest, alternatives to smoking to slowly being banned largely due to ignorance is incredibly frustrating...not to mention frightening.