CNN has an article up about the various signs that the TSA uses to determine if a person might be dangerous and require heightened "screening". Among them, the following: "Very arrogant and expresses contempt against airport passenger procedures."
Does it seem to you like a terrorist trying to blend in with a crowd is likely to be calling attention to themselves by decrying the security practices of the TSA while standing in line at the airport? If not, you might ask yourself why they would bother to screen such people more thoroughly. The answer becomes clear immediately: It's not about safety, and it was never about safety. It's about authority. Dare to question the government, and an agent will be around shortly to humiliate you in any way possible, and maybe next time you'll think twice and shut up in line like the good little obedient citizen they want you to be.