It's the art of conversation and the goodness of it with someone. It originates from Ireland, came across to the North Uk and finally to the South sometime around the 2000s.
My mate Tom has 'good' banta. He's fun to meet and chat with.
You can also say someone has 'bad' banta, although you'd usually say 'shit crack'
Someone who's been working in corporate for along time brings over engineered ways of thinking to startups.
Jim: "Let's hit the market tomorrow and validate it!"; Jeff "But what about the QA Testing, Validation surveys, Focus groups, Consultancy Input, 50+ analysis document?", Jim: "You are so corporate damaged."