Hayward isn't as good at making contested 30 footers as Lillard is. I think most people's problem with Hayward is that he can't score as well on bad shots, or when the defense is locked in, taking away all the options, and has to force smth.
A lot of it is what Cy said also. Jazz fans see more of Hayward than players from other teams. Every premier player looks bad on multiple possessions in every game.
Nearly every team's forum has some section clamoring to trade their best player because "he cant get it done". Bruh there are even people on Spurs Talk who are convinced Kahwi can't be a #1 option.