Blasting Convo's

So I'm sitting here just watching TV and I know the TV is not that low especially Flat Screen TV's. I was watching Disney Channel and my sister is on the phone constantly talking loud. When I tell her to be quiet because she's extremely loud she gets even more louder. Also, she has her friend on speaker phone mind you where not in public to the point where you can't hear anything. Were only in the house and then the friend that's on the phone is loud to also they both start singing. So rude right? Once I tell her to quiet down she gets an attitude at me because I'll tell her something to do. Its better for me to tell her in a nice way then for somebody to tell her in a mean way by saying shutup. Don't be loud knowing somebody else in the room and its two other rooms in the house. I wish it was a place for all the loud people to meet up and do their own thing same as with quiet people. Haha I'm just saying.