Is this ticket worth fighting?

I turned onto a street with residential permit parking. A worker from the parking authority saw me make this turn and saw that I had stopped. As I'm waiting for a friend, she starts making her way to my car where she then hands me a ticket. I asked her why she gave me the ticket and she replied, "I already wrote the ticket and didn't know you where in there"! Is this unethical? Do I just pay the damn ticket?