That's an interesting viewpoint about the grocery store. I guess I'm rude(although I don't reach over or push,) but I do say excuse me if someone seems to be stuck in one spot. But if I'm standing there staring and trying to decide, I don't mind if someone reaches in so they can be on their way.
I think people are much more daring via email, text or social media. I've seen some things recently on Facebook in my husbands family that I cannot even imagine people saying face-to-face. It's really quite cowardly, in my opinion, when you live 4 hours away.
I was taught to say "pardon me" or "excuse me" when I bumped into someone, didn't see the person, failed to hold the door, or inadvertently committed some other unintended transgression against another human being.
Life is odd today, as in bizarre.
Today "excuse me" is used to "politely" tell the other person hurry up, get outta y way, I'm in a hurry and you're not as IMPORTANT as I believe myself to be.
I never interact with these people, in fact my spidy sense tingle as they approach.
I simply MOVE myself quickly out of the way to avoid a scene.
I suffer from PTSD and my reaction wouldn't be pretty, therefore I use preemptive techniques to filter and restrain actions that would inappropriate.
I avoid crowds and large gatherings as much as I cam, often choosing to go to the grocery store at 3:00 or 4:00 AM to lessen these interactions.
When I do go with my wife, she chuckles or smiles wryly as I slowly start to move 10-20 feet away to avoid improper interactions on my part.
Sadly, life isn't a two way street.
Most people see it as their private one way street, leaving you to walk along the roadside.