Personal Space

So when you pass by someone, you often let them move into your personal space with the understanding that such proximity is uncomfortable at best and that they will get out of it as soon as practical. This is why it is merely annoying.
When someone gets in your space when you mean to pass them and physically blocks you from continuing on their path, then they have started something. This is a remarkably agressive move, and when used by someone who is not intelligent enough to be aware of their actions, can be very problematic.
Some people are recliners. People who have never felt real surges of adrenaline and agression. They have no idea how close people can come to reacting to such an offense in a basic manner. They are lucky most of us have been trained away from standard reactions.
And then they piss us off intellectually by saying they didn't get in our face. The illogic is astounding.
I had quite a bit of ranting, but I'm just going to say this; treat those around you with respect. Simple respect. You are not better than everyone else. Better than a few people quite probably, but if you catch yourself thinking you're better than most of the people around you, then you are wrong.
Don't get in my face for the next couple days, I'm not reacting well to it.