I know that does happen, and it absolutely shouldn't, but is not very prevalent, and it is not close to the only cause. In my experience, the majority of BYU students and graduates do not feel that they are more important than others, nor do they demean others. I have seen a few cases, but not many. Also, it is common for people to resent rejection. I know people who dislike BYU merely because they were not accepted, often with associated feelings towards someone who got accepted that they deemed as less-deserving. This is common with athletics, arts, and other areas where people work hard but do not reach their goals. Rudy Gobert feels that 26 teams made a mistake on his draft night, and while he may not hate those teams, he didn't grow up dreaming of playing for a specific one. There are tons of examples, especially in athletics, with people feeling spurned--and, as a result, hating something they once loved.