Wow, how can "failing to sit down when requested" be obnoxious.
When you're called to a scene of reported crowd violence and you're duty is to restore order to be able to ascertain who or what in that crowd represents a danger to safety and you issue instruction to either disperse of sit down, and an individual repeatedly responds by doing neither, and then when they do finally start complying by leaving the scene and THEN TURN AROUND and start walking right back to the scene, it is more than stupid, it is obnoxious.
I wouldn't sit on the ground either if I didn't want to.
A police officer who asks you to assume a sitting position for sake of your safety and his own is not making an unreasonable request in a circumstance like the McKinney pool party incident. If in that instance you refused such an order, in the USA you'll more than likely find yourself being handled to the ground, and if you resist in the slightest you'll probably find yourself cuffed until the officer can resolve whatever is going on to make sure safety is maintained for everyone, including you. If you don't like that you will have opportunity to tell it to a judge, and/or some other government official if you like.