1) They are BYU biggest recruiting rivals
2) There is a whole lot of religious bigotry among several of the fan bases
3) They label themselves the "Conference of Champions," yet BYU has a unanimous football National Championship prior to the PAC 12's last one. It's weird to claim retroactive titles that nobody else recognizes.
4) They generally play weak OOC schedules, but still prop up their 2-3 loss champions as a playoff contender.
5) It's a poorly managed conference with by far the worst tv network of all the P5 conferences