You are presenting this without the overall context tho.
ALL of last year, everyone was talking about Rock and Vin Diesel beefing and ALL of the cast was taking Vin's side over The Rock's. You don't think that came off as disloyal to The Rock? The fact that his "family" were publically taking his opposition's side and making him the odd man out? Keep in mind, they might be "family" but there is clearly a hierarchy. Vin Diesel holds the most weight and gets the most money and he ain't sharing that wealth with his "family". So why should Rock do the same when his peers aren't doing it?
That whole Vin/Rock beef was writing on the wall of how this was gonna breakdown. If your "family" isn't gonna look out for you, you gotta do what's best for you.
Facts