I will plug my ears if you're just generating noise with it. But if we're in public, especially at a place which ostensibly exists for the purpose of exchangin

I will plug my ears if you're just generating noise with it. But if we're in public, especially at a place which ostensibly exists for the purpose of exchanging ideas, then I will begin by assuming that you are trying to make some kind of point, and that you judged that this point is important enough to overcome the embarrassment of shouting through a megaphone to an audience that on average preferred you didn't.