banter

What is 'banter'?

Here's a definition:

BANTER | meaning in the Cambridge English Dictionary

And another (with a warning about the banter!):

Urban Dictionary: Banter

Peter Trudgill writes a regular column for the New European:

Probably all cultures employ banter, but it seems that some utilise it more than others. Banter is certainly very common in British and Irish society, and some commentators claim that it is more usual amongst men than amongst women. A difference between cultures might explain why misunderstandings can occur 
The late Geoffrey Leech, professor of English linguistics at Lancaster University, pointed out that one of the more interesting of these conversational principles is the ‘Banter Principle’; and he provided some important insights into the nature of this. Banter is essentially mock-impoliteness. You pretend to be rude to somebody as a way of stressing and reinforcing group solidarity. The Banter Principle is based on the following idea: “We are good friends so we don’t need to be polite to one another. If I insult you, you will understand that it’s a joke, 
which will prove what good friends we are.”

PETER TRUDGILL: Where did ‘banter’ come from? | The New European

With a little more here - and some advice:

How To Banter (Without Being an Asshole)

Here's some advice for young people:

What Is Banter? | Internet Matters

And here's a look at the current dangers:

From Banter to Bullying | Working Transitions

Banter in the workplace - hilarious, or harassment? | Ashfords Solicitors

With a couple of helpful videos here:

Banter with care | Conversational Leadership

When does banter become bullying? Is Banter Healthy or Toxic?

.

.

.