I think on some level John doesn’t want to know for sure if his academic struggles are simply laziness or a condition. Not knowing something like that leaves room to shift blame in your head as it suits the situation. It’s also something he hasn’t ever considered. He might just not be ready to process the idea at the moment. Either way Nina is carefully framing everything as normal & not something to be ashamed of. It’s more kindness than many people get from a professional. Although I can understand why some professionals run out of kindness over time. It’s draining to care. Especially if it’s a huge part of your job & outcomes are often grim. John simply has the benefit of having a friend/coworker who likes him being the one floating the idea. It’s not the kind of thing Carol could do with he same level of tact. The fact that Nina was able to suggest that he might have a learning disorder at all without John getting upset says a lot about her framing & tone are gently presenting ideas to him in a way that isn’t judgmental or adversarial. It’s something we can all stand to be mindful of from time to time.