Society's unwritten rules.

I cringe repulsively when someone gives me a limp unenthusiastic handshake. It just doesn't feel right to be so apathetic. I've always associated a firm handshake with "goodwill", and not firm, but far from limp handshake to be "nice to meet you (but I'm not really as interested as I should be)". I lose respect instantly if I'm shaking hands with jello.

Walking on the sidewalk reminds me of my walking thread from a while back. It always annoys me that people won't walk on the right side of the sidewalk and almost appear to want to intentionally bump you and force you to decide.

I also do get annoyed when people go through the "in" (at the moment) door and one person wants to "go against the flow" or wait it out. There are usually two doors for a reason, this being one of them.

Jam it back in, in the dark.

Good point I had overlooked that possibility. If I see you vigorously shaking hands with someone else after giving me a poor handshake though, and it looks like you don't have carpal tunnel syndrome there, then that's a different story, explicitly showing rudeness. If you have a limp handshake and are generally unenthusiastic in your mannerisms afterwards, then that also raises concern.

I also read an article yesterday about the politeness of people, which reminded me that holding doors open for any person behind you, girl, guy, whatever. That seems to go without saying everywhere I look, although I don't know about other places. Here, it's VERY unusual to see someone not try to hold the door open for another person (not letting the other person go first necessarily, but at least propping the door open so that the other person exerts minimal effort in propping it for themselves to get through).

There's nowhere I can't reach.