I had a guy do that to me. I pulled up to the last light before a long stretch of open road. There was a guy ahead of me at the light so I stopped behind him. Light turned green and we took off. He was going really slow so I passed. Wasn't long till I realized he was right behind me. I sped up a bit, he sped up. Slowed a bit to let him pass, he slowed. Finally lost him when I turned.

Came upon him in the same spot a week or so later. He dogged it when the light turned green but I didn't bite. He finally figured I wasn't playing this time and sped up. Saw him there a few more times but he knew I wasn't going to pull so he ignored me.