There is a positive that you can take from this and that is that you are willing to stand up and express how you feel. I know it's not resulting in the outcome you want but I think you can feel proud that you at least articulated your concern to the CEO. The fact they dismiss your answer is upsetting, but at least you said how you feel. I bet a lot of people, myself included, would never say anything to 'rock the boat' while feeling agony and inadequate. I'm impressed with your strength and your assertiveness, in what sounds like a crappy work environment.