I love this episode, it has always reminded me of the difficult relations between a mother-in-law and a would-be daughter-in law, especially in cultures when two-three generations share the same house.
I guess Jadzia approached the Klingon wedding rituals like an exotic fairy tale - funny dresses, old-time chants - she considered it a mere formality and totally underestimated the in-culture perspective. Lady Sirella did not approve of Worf either, he was practically a pariah, and his alien wife was hardly going to contribute to the good social standing of the House of Martok in the Klingon society.
I really like the moment when Sisko tells Jadzia that she actually should apologize and if she has so little respect for Klingon traditions she should never fall in love with Worf. As usual, Dax was too haughty for her own good but she found a good match in the person of Lady Sirella.
Sirella was magnificent – a real Klingon matriarch – and she gave our beloved Trill princess a valuable exercise in humility, no bed of roses for anyone, especially outsiders.