Dusty Grudge

When someone brings up an old grievance that was dead and buried and attempts to revive it to suit their purpose. For example, say a woman named Katie dislikes the fact that one of her friends has bought something Katie wanted for herself. Instead of simply stating annoyance just about that, she also starts referencing a time when they were in school twenty years ago and her friend had kissed a boy that Katie had liked herself. That's a dusty grudge. Similarly, when someone gets personally annoyed about something which happened many years before they were even born and starts flapping gums about it and getting all irate; that too is a dusty grudge. For example, a black friend on a night out does not take too kindly to the request from his white friends that he to go to the bar. Rather than tell them to go themselves, he then journeys a bit too far off the freaking scale and starts huffing and puffing about slavery and opression of black people in the 1700's. Extremely dusty gruge.