1, 2 are more justifiable, but I don’t think I would really judge someone for 3 either.
Probably 1. I don’t know. I hate that kind of situation. I never know what is the right thing to do.
I wouldn’t do it anymore. Especially if they aren’t really whiny/demanding in general. I’ve had a couple roommates who have been pretty particular about things like temperature, touching bugs, and lots of things. So that actually started to get on my nerves a tiny bit, but even then, when they asked me to not burn stuff, I didn't.
No. I wouldn’t. It seems like a recipe for disaster.
It probably depends on if I’m in a rush or not. Usually I’ll put it back, but occasionally I’ll just tell the cashier I don’t want the item after all and they seem to be not that annoyed.
Pick it up and trash it. I think I had that kind of thing drilled into my head enough as a kid that I just feel wrong not doing it.