Proof that you REALLY need to watch what you post on social media!

A fellow country singer's merch manager talked smack about The King of Country last night after George Strait picked up the Entertainer of the Year Award at the ACM's.

Now, the award was fan voted! The country singer he works for was also nominated.

The guy posted to Twitter after George won " Really ACM's? Entertainer of the Year, not How's my career. This guy is not an entertainer".

The entire Twitter page was deleted shortly after the comment was posted.

Look, we all know George just stands up there and sings. You can't expect him to run around and shake his butt.

There is a lesson here.. think BEFORE you post!