You most likely cannot fight it. Another person's recklessness or violation of the law does not mean that you did not violate the law, too. If you were reckless, you could be arrested for reckless driving, no matter how reckless the other person was. If you sue the other person, or he/she sues you, then the fact that you both did something wrong is factored into determining who wins how much money; but in terms of criminal liability, your own liability stands on its own and is unaffected by the other party's bad behavior.