Remember in "Undiscovered Country," when the Klingon lady, Heavy Metal Santa's daughter, expressed her concern about her people losing their culture. The idea that they'd just be absorbed into a Human-centric society scared her.
And in the next movie:

Jump for the hat, little Klingon! Wear our clothes in a recreation of our own history and jump to get one of our silly hats!
Was the irony intentional?