Well, as others have said, it could mean the Sanders wouldn't be who he is today without Vetrone. Or it could mean if not for Vetrone, Sanders wouldn't be at RU. Neither of those imply that if Vetrone leaves, Sanders leaves.
Even if that is what he meant, he is a young guy, and losing all of his current coaches is something he fears. Big deal. Fans should be reassuring of how much we want him to be here, and how he should give the new coaches a chance. Instead, everyone turns right around and says "Well F*ck you then...go ahead and transfer." People have been hurt so much by this team that they have these crazy reactions to every bit of news. Even if he was saying he would leave if Vetrone was fired, keep in mind it is the reaction of a 19 year old, who probably just needs some time to cool off.
I agree that you or I wouldn't send that tweet. But I am all grown up, and an attorney who thinks ten times over about anything I say in public (except on here sometimes, lol). We all wish that these kids were more mature, and considered every tweet and how it will be interpreted by fans and media carefully, but that is never going to happen. This is likely a difficult time for Corey, who is our best player and someone who we all should be supporting, rooting for, and encouraging to stay. The tenor of this thread is alarming to say the least. I simply cannot understand how or why people react this way.