Fans booing Roman Reigns are not the people WWE should be catering to. WWE's TV audience these is comprised of a lot of big event congregating stereotypical smarks who are critics not fans, like wearing New Day unicorn headbands, boo a babyface if the heel is a better worker, hijack shows & try to sabotage any direction WWE tries to take, & create an illusion sometimes based in reality, but oftentimes not, of who should & shouldn’t be pushed.

Fans liked Roman Reigns when he was apart of The Shield & he was red hot in the Summer of 2014, but as soon the internet got wind that Reigns was supposed to be "The Guy" ahead of Daniel Bryan the backlash began & the pavlovian response of "we are supposed the reject the handpicked guy" kicked in. In the big picture all the other little theories about why he can't get over as babyface (ring attire, theme music, fallacy he can't work etc.) are inconsequential.

If you want to look deeper, while being badly booked & miscast hasn't helped, the fact that he's tall, muscular & handsome, another reason why the majority of his haters in the Internet Wrestling Community resent him is because they're jealous he can get pussy - they can't relate to him because they've never had any! hence why majority of the IWC root for the regular looking guys like that fat slob Kevin Owens as he makes them feel less inadequate in comparison Reigns who has the body of Thor & the hair of a God. Also whether or not they want to admit it, the majority of hardcore wrestling fans are subconsciously biased against guys who didn't go through the indies & have the WWE look. Bottom line is Reigns is rejected by because he's the handpicked guy of WWE management to be the heir apparent to John Cena.