I always find it staggering to hear of singers disrespecting their musicians. It happens. I assume it probably their own insecurities more than bad manners. If you're working on a ship the band are probably an integral part of your show. With rare exceptions, they'll be great readers and used to work with singers just like you. Make sure your music is totally clear, well written and accurate. If something's doesn't sound right, differ to the Musical Director during the rehearsal – that's their job, and be super prepared so you don't waste anyone's time. The rehearsal is for the band and the tech crew, not you. Respect the band and they will do a great job for you. Ultimately it's in your own interests.