I honestly don't think players like Koepka or Reed care what the fans or fellow tour players think about them or how they play. Both Koepka and Reed are reasonable faster players and are gonna clash with slower players like DeChambeau. They play at a faster pace and like the pace if possible to be faster so they can stay in a rhythm. I think that's where some of the friction comes from.
BTW Koepka honed his game on the Euro Tour and because of that experience he may look at things differently than many USA PGA types. I believe that's where he learned the hard knocks, shrug it off and go.