On the one hand, you're at a social experience. On the other hand, aren't you supposed to have your senses engaged in a shared experience? The interpersonal conversation diminishes that. On the other other hand, as long as you're having fun and not doing harm, do whatever. As the Master of Ceremonies, I love it. On the other other other hand, talking pushes up the noise floor, making louder concerts a necessity. A louder concert is more dangerous to your hearing.