Nobility commands respect whether its deserved or not and the chain of command in both peace time and war is rigidly adhered to. What these underlings really feel about their betters is most likely spoken about in whispered tones. it always does well, however, to make sure those conversations are had out of earshot of any who would take offence.
In short the Kingdom is a place where honour and loyalty to the crown is ingrained within society. Only those who have worth to the Crown or have some use to the noble houses have a chance of making it to the Vale. The rewards for loyal service are great and even the lowest member of a house can attain wealth and power.