Things I learned as a kid in the neighborhood:
If a new face starts making talking noises in onyones direction the script was and still is simple.
1. Yo, anyone know this "them"? are they anyone's "us"?
2a. if no then "dafuq is u and what do u want man" with a potential "beat it chump"
2b. if yes then "Whaddaya need fren?"
Quit letting strangers tell you things that divide your people.
"dafuq is you?" is a most powerful statement for self and crew preservation.