I'm not sure it makes sense to <i>disable</i> this -- I can only imagine people forgetting they disabled it, then not understanding why they're not getting a family member's folder of photos.<p>And you can already remove something shared with you by going in Drive to "Shared With Me" and clicking "Remove" in the context menu for the file/folder.<p>Otherwise, sharing something with a Google account is no different from sending an e-mail, e-mailing a Calendar invite, etc. After all, you can't turn off receiving e-mails or calendar invites.<p>But, like Gmail, what Drive <i>should</i> have is the ability to block specific sharers.<p>In the meantime, you can use the "Report abuse/copyright" menu item on any shared item, although I don't know if that helps. :(