Sometimes on AIBU an OP gives a story where someone has made a comment they didn't like. It often comes when OP has been a bit inconsiderate and the other person is upset or annoyed.
OP (or a relative/friend) then comments that it must be 'because they are jealous'.
They're upset/annoyed - why would they be jealous? What is there to be jealous of?
AIBU to think it's not because they're jealous - and not understand why that's the default?
(This is not a TAAT - I have seen this comment today but have been thinking about it previously.)