It’s healthy to think with more than one in mind. You’re not the only one living here ya know, so maybe taking someone else’s perspective into mind every now and again can’t hurt.
What do other people think of me?
They probably didn’t think that was funny…
Oh God, they’re all looking at me.
No one wants some jackass guitar hero making noise at a party when all anyone wants to do is blast music. And trust me, one person playing live guitar is not music. PERSPECTIVE. The Dude abides. The whole thing kind of goes hand in hand with self-awareness, really. Before you should worry about being aware of what other people are doing, make sure you can do the same for yourself.
“Chiggity-Check Thineself. Lest Ye Wreck Thineself.”
As a player, think of your audience. They’re the ones listening to you.
As an audience, think of the player. They’re the ones wondering helplessly what exactly it is you’re thinking.