As much as Sree says "right on his face" he says three times more behind him.Sree is a cry baby whose only rise to fame is his cricket controversy.A mediocre player is trying to say he is indispensable.
His past connections off the field has endeared him to many in the show and hence the privileges that he gets( the host never admonishes him, BB calls him immediately when he knocks,gives him free advice and pep talk,and you can see the host telling him about the demonetisation of Rs2k notes and mischeivously asking him about his stash.)
I don't remember him saying anything against KV behind his back however it is Karanvir who has always bitched about him and instigated hms against him. Remember when Surbhi said she wants to be nice with Sree and how he started telling her that don't do it. He is jealous from Sreesanth because he is insecure that he is the most popular hm this year.