Bearing in mind that 99% of the time, exchanges between FT posters and flight crew are, consciously or subconsciously, cleaned by the poster to favor their point of view, I'd say that the OP was arguing with the wrong person.
The OP asked a simple question: How do I deal with this divider?
The OP got the correct answer: You don't. It doesn't work the way it should.
Op then wanted...what exactly? A cute little "we so sowwy" cake baked in the shape of a heart? What was the point of pressing the issue at this point? What was the FA supposed to do? Take out a cordless saw-z-all and cut the divider down for the OP?