@AudreyJune oh i need this book.

may i also recommend the old standby weapon of the southern belle, ready to be whipped out from a bra and stabbed into someone's heart:

"oh dear. how embarrassing for you (that you've said that/think that/etc.)".

for full effect, pair with a look of utter devastating sympathy, a shake of the head, perhaps a "poor dear." or - for the true coup de grace - "bless your heart" before going to investigate the punch bowl.