>>33383112 (OP)banter is just quick wits, and quick wits is being comfortable with yourself and understanding your environment.
the shortcut to quickwits is to watch people like Don Rickles. learn some phrases you can throw out in everyday scenarios then create your own observations.
https://www.youtube.com/watch?v=RONkAEMduSc
you will obviously never be this wisecrackey with people you dont know, but the concept is the same.