Rollins is just trying to take his role as Champ/"Locker Room Leader" to another level but in doing so he's completely showed his ass to the wrestling world.
If you read his initial tweets that started this whole thing, he's very clearly trying to praise the locker room for the last PPV and tell everyone how proud he is of the effort. But... he tried doing it by going out on Twitter and saying that nobody alive can do what he does as often as he does. Ospreay called him out on it (Ospreay's also correct to call him out here, IMO) and Rollins resorted to looking like a fool in order to try to rip Ospreay for having the nerve to disagree with Rollins' very brash and uneducated statement. Rollins effectively worked himself into a shoot here.
There are a hundred different ways that Rollins could have handled this situation that both accomplished him showing pride in his locker room and not sounding like an entitled douchebag and he effectively failed to do both. Ospreay earned a Twitter follow from me after this one (actually, it sounds like he gained about 5k followers over the last few days) for standing up for himself without resorting to the tactics that Rollins did.