25% Fault for another Driver's lane change into me.

I was assigned 25% fault for coninuting straight in my lane on a freeway interchange. The two far left lanes of the freeway veer off onto another freeway. I was in the left lane of the two lanes that veer off to the other freeway. The car that hit me was in the right lane and was attempting to cross two lanes of traffic and stay on the freeway we had been traveling on.

I was not speeding and was not distracted by phone or anything else. I was assigned fault because they said I should have known people make last minute lane changes on this freeway exit and tried to avoid it. I never saw the car coming so I don't know how I can avoid something I can't see. Is this worth fighting?