Stop others from spectating

Dear riot, could you please add an option to allow people on your friends list to not spectate you. It gets very annoying when my brothers or friends spectate me and tell me what I should have done. Im also very bad at the game and have bad games all the time so when people spectate me its very infuriating and then they laugh at me. They also get upset when I ask them not to spectate me and when I want to unfriend them.