For me, it is always when someone asks me a question which answer could easily have been retrieved through their phone online. You’re meaning to tell me, that what you have in your pocket, is not some form of gateway to information that can answer anything you’re curious about at just about anywhere?
So you go and bother me instead, whom for all I care, could just lie to you or to be honest, admit that I don’t know everything. Because that’s what your god damn phone is for now and has been for a while now. Go use it, stop nagging me, I know when to use it when I want to know something, I don’t go around bugging people and asking stupid questions.
I disagree with your inexcusable behavior, as I really don’t mind saying “I don’t know” or just answering the question.
For me, littering is inexcusable: just find a trash can, or carry your trash with you until you find a trash can to put it in. Don’t throw trash on the ground…!
Also inexcusable: saying “it’s nothing” when I said I couldn’t hear your for the 2nd time. Like, if I ask you to repeat yourself, I am interested and just so happened to not hear you (maybe we’re in a noisy place, or you were facing away when speaking). If I didn’t want to listen I would’ve either said so, or just ignored you.