Should I plead not guilty to my recent speeding ticket?

I was clocked doing 68 in a 55 by a state trooper traveling the opposite direction. It says on the ticket that he clocked me with radar so I am uming he used dash mounted radar to clock me. I do not think I was going that fast and there was another car that was catching up to me and probably right beside me as I ped the cop who was driving the other direction. That same car continued to p me and pull away from me until the next red light at which we were side by side. That was when the cop caught us and forced ME to pull over to gas station that was right there and gave me my ticket. The cop even checked my window tint which is OBVIOUSLY legal and not dark at all making me think he pointed me out thinking I was a young kid or something. He was not rude but I got a vibe that he didn't want to talk to me at all and just took my license to his car after measuring my tint and wrote me a ticket. Most cops ask certain questions such as "Whats your hurry?" or "How fast do you think you were going?" but this guy did not ask me anything but for me to roll my window up a little so he could measure the tint. Should I plead not guilty and explain the situation between the other car? I was very quiet with the cop so I am sure I did not give him anything to really remember me by over a months time. I was not rude at all, just did not say yes sir as as I normally would since I felt he was trying to write my ticket and leave asap.