You've taken issue with other people speculating but now you have decided the neighbour must have poor mental health. Where did that come from?
Because OP said she thinks neighbour suffers with anxiety. That’s poor mental health.
If the neighbour was not being reasonable why do you think OP should help?
Being unreasonable because you set out to be deliberately rude and being unreasonable because you find yourself in distress are two different things.
The OP is not responsible for helping another adult manage their emotions
I didn’t say she was. But showing decency to a one off event is simply caring for another human being in distress. Rather than being fuming and shouting at her husband not to help.
I'm acquainted with someone who expresses emotions quite dramatically and ropes everyone in to support them through their latest crisis but by their own admission they can't even remember what they were upset about 24 hours later. Dramatic emotional expression does not necessarily correlate to the intensity of the emotion experienced.
Sounds like that’s happening on the regular. In which case I said helping once at first instance and then setting boundaries for subsequent was reasonable.
I sometimes wonder if people rush to "be kind" as a way of feeling important.
Oh, so we’re starting the other Mumsnet trope of being ‘performative’ now. I see. I sometimes wonder if Mumsnetters are stone-hearted zombies who all hate the world and everyone in it. Oh well. We move on.