Heckle Not, Banter Minimally
Some performers are chatty, some aren't. There are musicians who like to tell little stories to introduce their songs, and some of those stories sound like charmingly off-the-cuff anecdotes. They're not. Listen to the same performer at a different show, and you'll hear those anecdotes told almost exactly the same way. That's because the stories, like the songs, are part of a rehearsed performance. Unfortunately, there are audience members who mistake the chatty interlude for a break in the performance and an open invitation to strike up conversation — or heckle.
Some performers might humor the conversationalist in the audience for a little while, but there's a fine line between funny and annoying banter. After all, the audience came to hear music, not chitchat between the musician and some random guy in the crowd.
Similarly, nobody came to hear you hassle the people onstage about their musical ability or why their private life is a joke or how you want a refund for your ticket because you can't hear anything. As long as you're talking, nobody else can hear anything either.