I'm from the northeast. I'm not from the South. I'm not from the Midwest. I'm not from that other coast. I'm not nice, and I'm not friendly, and I'm not laid back.
I have no desire to be any of those things. I am polite. That is all I ask of you. Politeness. Not friendliness. That's not what I want.
If I'm in a coffee shop, please don't talk to me. If the only open seat is across from me and I move my stuff to accommodate you, please do not take that as an invitation to speak. I was polite and allowed you to sit down. You could at least have the common bloody decency to leave me the hell alone. Seriously, I'm stand-offish even among my own people. Take the hint.
Also, I am not particularly interested in your addition to my conversation, especially if it expands in a paralyzing mire of irrelevance about a throwaway remark. It is my conversation. It is not overly loud, and it is none of your business. Get out.
I know, I know--how is anyone supposed to meet anyone? Well, is it really that hard to be introduced?