So, I’ve done a fair number of these screenings in mental health settings. They are not very clearly worded, which is silly given what they’re screening for - though in my experience most solidly NT people seem to have little trouble reading between the lines.
If you’re boring people without realising, chances are someone (a parent, a teacher, a friend) might have brought it up to you at some point, which is how you might know you hadn’t realised.
The question also wants to know if you can relate to the experience of recognising you’re boring someone. We all bore some people some of the time, it’s just a fact of life. Most people can recognise when the other party is losing interest. It feels pretty crappy, and you tend to remember the feeling. If you have no recollection of ever feeling anyone is bored with you, chances are you are either missing some cues, or the feeling of boring someone doesn’t particularly bother you, which both suggest some differences in social communication.
The question about misunderstanding people’s motives isn’t asking whether you can be 100% sure you objectively understand them, but it’s trying to gauge whether you are commonly confused by how people behave or communicate.
People who have trouble inferring others’ motives might be taken by surprise when someone who invites them in for coffee after dinner out together then tries to kiss them, for example. They assumed the invite was literally just for coffee, as explicitly stated - and didn’t spot the sexual / romantic intent.
People who have trouble understanding others’ motives might also find it difficult to make sense of it when someone ends a conversation by saying ‘we must catch up for a coffee soon’ and then never arranges or accepts invitations to catch up over coffee. They don’t realise this is a throwaway comment intended to end a conversation kindly.
It’s this sort of thing they’re after.
In my experience the more deeply and offensively nonsensical the questions seem to someone, the more likely it is there’s some neurodiversity at play. Not because the questions aren’t woolly and imprecise, but because ND people are significantly more troubled by wooliness and lack of precision.