1. People who call it a personal vaporizer or PV for short. It's an e-cig to me, and that's what drew me to it in the first place.
2. People who use the language of the anti-smokers and call them stinkies: you were a smoker a few days or weeks ago. Stop playing to their hands.
3. People who say we should hide in corners and not use e cigs in bars
4. People who constantly recommend mods and specifically, the EGO, to new people who clearly want something resembling a real cig
5. The word analogue to refer to a cigarette
6. People who immediately blame e cigs for every new cold, rash, or other condition common to mankind.
7. many, many more, but I'll stop for now
Most of those are ones I wish I'd said first.
In the general vein, I'd add vendors and posters who act like it's some great moral or aesthetic error to want a juice that tastes like a cigarette.
People posting using the first names of the suppliers/retailers, instead of using the company/website name.
Actually, I find this rather endearing (even if admittedly confusing at times). It underlines the neighborliness of this community, and the newness of the product.
Here's one that I just encountered today: I just ordered a bunch of cartomizers of a brand I've come to like a lot, some regular and some low-resistance. Once they leave their boxes they will be indistinguishable, unless/until I figure out a way to keep track. Maybe time for some standardization. (But then again, I like the DIY/pioneering/new-industry feel this connotes.