Like you’ve just been with these people for so long you’re like… fuck it who care if they judge me, they pronably got so used to my weirdness anyways…
But strangers… better keep quiet… don’t want them to have the image of: “oh that weird guy/gal that sings to himself/herself all the time” be permanently in their head…
That’s how your close relationships are supposed to feel. They should be people you feel comfortable to be yourself completely when around them!
I’m like that with my wife and a few close friends. Not so much with my family though.