Don't go on a crusade. What he said was wrong, and it was really bad management. Don't say anything about that, either. Just continue to do your job, whatever that is, to the best of your ability. Which I will bet is a lot better than a lot of other people could do it. He's insecure and trying to mess with you. Don't ever let someone like this get to you. It's what he wants because he is older, and knows you could replace him within 6 months.
Prove to him that not only are you great, but that you make him look good too. It's a skill worth learning so you have it for a paying job, and you never know where your best references are going to come from.