Heckling is an act of cowardice. If you want to speak get up in front of the microphone and speak don't sit in the dark hiding. It's easy to hide and shout and waste people's time.
I think people are more savvy about cooking food and dining. I notice they are looking for more value for their money - not in larger portions but more in terms of healthier fresh farm-to-table dishes with a nice presentation.
