If they try to be your friend: lawyer.
If they try to reason with you: lawyer.
If they try to guilt or shame you: lawyer.
If they threaten to arrest you: lawyer.
If they threaten to call in backup to drag you out: lawyer.
If they do arrest you and drag you out get a lawyer and sue the police department.
The time to argue is through your lawyer during the lawsuit. This is how you win.
You don't have the right to an attorney until you are charged. The best thing to do if approached is be calm and polite, leave if requested, and if arrested, then do NOT give a statement and ask for an attorney asap.