I have 3 google accounts which have a bunch of auto-populated email addresses and contacts I have never intended to add to my android
I went to Settings > Accounts > Google > email@example.com > Contacts > Switched toOFF
HOWEVER when I go back to the phone app, all of the garbage auto-populated email addresses are STILL THERE. And when I select one of them, it clearly indicates with a google logo it was "synced from google account".
I intentionally don't use Google stuff. I want it off my phone.
Lollipop 5.1 Galaxy S6