A person who can give the appearance of being from a wealthy neighborhood, or connected to someone with influence will almost inevitably receive better treatment than someone they perceive as impoverished with no connections will. Some activists make it a habit to pay a visit to their local politician before major demonstrations, simply so they can carry that persons business card next to their I.D. in their wallet. Others have been known to officially change their address. Invoking privilege by firmly but politely informing them that you have nothing to say to them until you've spoken with a lawyer is a very good idea. Once you've notified the police that you have nothing to say until you've spoken to a lawyer, all their questioning, other than for purposes of identification, must stop.
Some activists see being arrested as a chance to slow down the system further.
Tactics have included giving no name or going limp at points inside the jail facility. This is a personal choice. The power dynamics in jail are obvious. The police can isolate you at any time. They do occasionally take people aside and beat them, or subject them to pepper spray.