4 points
Because the 'splaining phenomenon is about perceived but unearned superiority which leads the 'splainer to 'splain to someone who knows a great deal more than they do and, crucially, someone who the 'splainer ought to realise knows more than they do but doesn’t because of the illusion created by the society they live in.
I’d have added “(born) middle-class” because that’s an important part of it too.
