Those close to me know I'm armed with a firearm and knife most of the time I go out. They know I prefer to sit in certain places and usually ask me where I want to sit...
On top of that I have several relatives have trained in martial arts like I have. Some of them have become my students and they know I emphasize awareness in the martial arts classes. We do drills that not only work on self-defense techniques but also awareness of what is behind and to the sides of us and where the exits are.
I've seen some pretty stupid stuff over my 65 years of living, especially when I worked as a bouncer, bodyguard, and in mental health. Rarely does anyone's actions surprise me but I do my best to not be complacent or too comfortable.
As far as the comment about avoiding places that have trouble or picking out when you go out, sorry but you're missing the point. I've seen simple arguments between a couple who looked like they were educated and not prone to violence, escalated into one of the parties drawing a knife and stabbing the other.
Some people snap and when they do you better hope you take the right action or "somebody gonna get hurt real bad.".
There is a balance between being prepared/aware and making others' nervous by giving off weird vibes. There's also a time and a place to make direct eye contact as a final warning before things escalate. But if you can't backup the "look" then it's only a matter of time before somebody calls your bluff.
I think it's a good idea sometimes to do a simple scenario training and have it recorded. A lot of times under stress we do not realize some of the body language we do (or how we talk under stress). As a good friend once said, "Shut the f*ck up motherf*cker" is not a de-escalation technique...
A lot of people tire out quickly under stress because they forget to breathe. Sometimes taking a deep breath, apologizing, can dramatically alter the negative energy in a situation. Patrick Swayze said it best in Roadhouse "Be nice.". Don't take things personal and be as nice as you can.
Good job in being aware...