Some over zealous LEO's may see passive aggressive as confrontational. Wrong as they may be, it still may only serve to escalate the situation. It's a personal choice and you would be in the right to take either approach. You have to be the one to decide what is appropriate for you in that situation. Just something to consider I guess.
Oh, I agree, but only you can decide how you respond regardless of what Mr/Ms LEO says or does. Know your rights and be ready to defend them firmly with common courtesy and respect. By taking the high ground, you have refused to be dragged down to a level that is less than civil. When "push comes to shove" one would/could always have that higher ground to stand on.