Certainly it was wrong of the pilot to "blatantly" dismiss your obvious well intentioned observations. Any observation by passengers with regards to the aircraft is more than welcome. The thing is though that despite your obvious concerns you still travelled......even though you felt adamant there was a crack. Again do not be dismayed in forwarding your concerns as I truely belive most flightcrew will listen and respond to such queries regarding the aircraft with a positive frame of mind.
Regards
