> There's a difference between polite pushback and being straight up disrespectful.

That's a distinction without a difference. Cops see any form of noncompliance as disrespectful ("contempt of cop"). You not only legally can, but absolutely should be able to tell a cop "Get fucked" to their face and walk away if they have no legal basis to detain you. The fact that in reality you will have your life ruined is a problem far worse than any "disrespect".