Banter can be fun until it becomes something else. Its not banter if someone is feeling hurt and not laughing. Banter might not be bullying; but it can look like it to someone on the receiving end. So watch the “no offence, but…” kinda comments and keep it clean when its about someone in the group chat. If you sense banter is actually hurting someone, its a good idea to PM them and ask if they are ok.