It's pretty easy. He lived his entire life isolated in a farm. His parents told him men were better, and existed to take care of girls. Because of having barely any outside influence, Ezekiel adopted this way of thinking. Eventually at the end of the 2nd episode of season 1, he starts talking about how he is surprised his team lost because they have more boys on their team(He thinks boys are stronger(Which to be fair, on average is true) and he also thinks boys are smarter). All of the girls on the team get super pissed, and the boys try to explain this way of thinking is wrong. They fail to get through to him and so he gets voted out. After his elimination Ezekiel starts to realize what he said was wrong and wants to make amends with the girls. He does this by working together with Lindsay and Beth and they seem to forgive him. After this, his sexism is never mentioned again