I've watched most of the shows this year and last. Adam and Blake are both terrific.
You're right - it was just an off-the-cuff reactive remark that has been totally blown out of proportion. The "country" had just decimated this team of 3 down to only 1 left, so he said he "hated" the general stated source of his team's destruction ("this country"). Kind of like when a friend or family member does or says something annoying, and some people might respond with "I hate you" in an instinctive, not-really-serious manner.
This being said, Sarah needed to go. Despite the potential you could hear in her voice, she always mangled every song to sound like some sort of deviant Alanis Morissette knock-off with hideous runs, trail-offs, mumblings and "stylish" on-purpose off-key notes in an attempt to sound "progressive." Despite the obvious potential, most of her performance were horrible from a singing standpoint.
Judith should have stuck around longer for sure, but frankly her performance the night before was not very good - all dancing/performing and very little melodic singing. Bad song choice. The "Voice" is supposed to be a singing competition after all, not a dancing & performance gimmick competition.
It is so transparent that you missed it (that is “invisible “) Beating up voters who do not agree with you, sounds familiar.