So, assuming this person is autistic, and that this sort of networking is required, some changes are going to have to be made. Just saying someone is ableist (especially when they’ve asked for help) isn’t going to get anyone anywhere. Reasonable adjustments must be made. some by a team, some by coaching the person and some by management.
Joan needs to be made aware that she can interrupt a monologue, ask for specific information on the objectives of a discussion and to not judge the person on their lack of small talk. People (especially women) often feel this is rude, and need strategies to help them.
The rest of the team need inclusion training and a bit of compassion. They don’t have to like it.
I don’t understand the social stuff, and how it ties in with a job. But if it does, there’s no reason why someone shouldn’t be coached in it, IF they get that it’s important to move up, they want to move up and they can change it. I don’t see how you could find out if you don’t try, but it shouldn’t be the whole solution. Maybe hosting an event as a pair, or having clearer timescales.
But, this can’t be done within a diagnosis. It seems to be the discussion here should be whether the conversation about initiating a diagnosis is appropriate between a manager and an employee. A person in a wheelchair is not going around not knowing they can’t climb stairs. But a person with autism can definitely not know they don’t communicate well, and be extra-disadvantaged by not knowing. Is it a manager’s place to bring it up? If not, whose is it? If they don’t and the person is disadvantaged by not knowing, is that discriminatory? And how else can they proceed.
I think the right thing must be to bring it up - it can’t be fair to ignore it - But I don’t know how.