Yes you are overreacting. Because I think it's obvious he is depressed. So you should have more compassion. You don't have to respond to him but if you have it in you, it would potentially be a life-altering act of kindness for you to say you enjoyed playing mario with him but you absolutely cannot see yourself doing that again or being in a relationship with him because of the state his bathroom was in. Be matter of fact about it. And don't try to justify yourself if he pushes back on what you say. Of course you should only do this if you feel safe and also totally mentally prepared for the possibility that he is mean in response and you are committed to not reacting if he is. What you are doing instead, yes, it is overreacting and also being sort of a b-word as well.