There is a way to completely get rid of this and instead use Google Now when you long-press the button on a bluetooth headset. Steps are as follows:
1. Find and disable the pre-installed app called Voice Command
2. Install the app Bluetooth Launch - https://play.google.com/store/apps/d...h_launch&hl=en
3. Open Bluetooth Launch. It's going to be a bit funky looking because it's not optimized for higher-resolution screens. You'll see a bunch of really small text with overlapping buttons on the left. It's ugly, but it'll still work.
4. Scroll down to Google Search, tap on it, and it'll expand a list of a bunch of things. Tap on the one that says 'com.google.android.googlequicksearchbox.VoiceSear chActivity'
5. Pair up your bluetooth headset, and long-press the button like you would to voice dial. You should get a popup that asks which app you want to use. Select Google Search and then 'do this always' to set the default.
This should pop you over to Google Now, which can recognize voice commands just fine, unlike the worthless LG Voice Command. It should also make Google Now the default behavior for long pressing the bluetooth headset button.