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The option you seek is available.
While you're in a multiplayer lobby, on your Xbox controller select the Start button > Mute Players
At the bottom you'll have the option to
A) Toggle Mute (mute selected players)
X) Unmute All
Y) Mute Group (this is what you seek)
When you select Y, additional options are available.
1. Mute all
2. Mute all but friends (mute everyone that's NOT on your friends list)
3. Mute all but party
CODBlackIce | Forum Moderator
Ghosts, Black Ops 2 & MW3