As an Army Vet, I will weigh in on this. I feel it is disrespectful. The only person a flag should drape over is a fallen soldier in his coffin. That being said, said soldier died for your right to do as you please and to not do what you want would in my own personal opinion, disgrace said soldiers memory. If you do chose to do it, please do so respectfully, cleanly, and neatly. Don't let it get burnt with cigarettes or covered in mud. Keep it in good condition.