With all due respect, you have a fundamental misunderstanding of the American culture, customs, and laws.

There is neither a law, nor a legal precedent, against the OP doing what was described. Period. Nada. End of story. There is, however, a legal precedent that indeed explicitly allows the OP to do exactly what was described. The Constitution, among other things, allows Americans the right to peaceably assemble.

Let's say, for argument's sake, that the OP was indeed trying to provoke a response. The right to peaceably assemble, as guaranteed in the First Ammendment, allows Americans the right, and therefore the responsibility, to express support or opposition to public policy. You can do neither sitting on your keister.

The OP did not interfere with the screening process in any way. The OP did not damage property. The OP did not infringe on the rights of others. The OP did not cause a public disruption of any kind. (disclaimer: two sides to every story, so this information is speculation based on the OP's report of the events in question).

The argument that you present of someone taking pictures of your house is a fundamentally different situation. Your house is your private property, and is again explicitly protected under the laws, customs, and traditions of American law. You therefore have the absolute right to make such a request, and expect it to be fulfilled. The airport, a public space, is another matter entirely.

As to the Rosa Parks analogy, it isn't entirely accurate in this scenario because she actually broke the law. And she is an American Hero for doing so.