The arrogant "eating popcorn" mockery of people who disagree with you is the purest poison against rational discussion.
Unrelated to the thread, but I find unmotivated disagreement (expressed with downvotes) also poisonous. I think it would be interesting to allow downvotes only in combination with a "downvote comment" expressing the reason of the disagreement.
And FYI it's not a mockery - I'm watching TV and eating, for real. It wasn't a metaphor, but I guess you didn't give me the benefit of doubt.