Lightheaded sorts?

BLONDES

Think of a hair color often associated with a certain playful stereotype about forgetfulness or airiness. The answer is plural and starts with "B."

"Lightheaded sorts?" plays on the double meaning of "lightheaded." Literally, it suggests people who are dizzy or airheaded, but the clue hints at "blondes" due to the stereotype (and pun) that they’re "light"-haired and sometimes jokingly called "lightheaded" for being scatterbrained. The wordplay ties the literal and figurative meanings together, making "blondes" the clever fit.