Feels more like a failure on the part of her date. A big part of active listening is keying in on things you're interested in and leading the conversation in that direction.
People with ADHD rambling at me for an hour was what I did before podcasts.
Isn't the point that her actual neurological condition made it harder for her to control herself from going on a long rant, simultaneously explaining and demonstrating how his diagnosis isn't as bad as he thinks it is?