I feel like this is something I struggle with a lot - I'm absolutely rubbish at banter because I struggle to think of what to say in response to things. If I say the first thing that comes to my head, it can sometimes be weird/not funny, but then other times all I can think of to say are really generic things like 'That's terrible!' (if it's something bad) or 'great!' (if it's something good).
I notice some people are always quick in with a funny comment or witty aside or even just something other than a boring filler like 'oh wow' (my go-to), but how do you get good at thinking on your feet and firing off responses? Can it be learnt?