It's tacky to lord what you have over others.
Gary asks Bryan for some of his corn because Bryan is a farmer with a full field and Gary is out of work and needs to feed his family.
Bryan wants to give Gary some corn.
Bryan shares some corn with Gary and tells him that they have plenty of food on the farm and to please come back when he needs more.
"Bryan tells Gary that, ""you're lucky to know me, because your family would starve without me""."
Gary is grateful for the help getting through a rough time and Bryan feels good that he has helped another human being.
Gary feels demoralized and hurt, while Bryan feels guilty for saying something so harsh to a person who came to him for help.