I guess you should tell your brother, especially if you are in a habit to tell him everything happening in your life. He'll feel hurt if he comes to know from another sources.
And do ask him why he hates Gurmeet so much... Even my parents get irritated when he comes on screen but that is only because of me and my pagalpan otherwise they respect him... Do ask your brother why he hates Gurmeet so much ok. Tell him, all PVians are eager to know his reasons...