Too many to mention. I have a virtual menagerie of pets, for each area of my life. But
@ScottP 's response reminds me of my staff, wife, children, explaining a computer issue, or customers complaining about our website saying "it won't let me___". And I ask when you say "it won't let me," what do you mean? What happens, exactly? And they just repeat something like "it just won't let me log in," or "it just won't let me fill out the form."
So I just ask them something like - "Okay, so when you attempt to fill out the form, appendages appear from the computer, and hold your hands away from the keyboard?"
Yes, I'm a jerk...much of the time (at least based on the thoughts in my head). And no, I don't actually ask that - with customers, anyway.
Vapewise, I guess it's just people that assume most people vape the way they do. And that if you don't, you're not doing it right, or you just don't understand. Thankfully, there aren't too many of those here. But I was recently enjoying a thread about TC, and it got shut down because of one of those people.