source: [困った顔のカツオが怒ったワカメに背を向けられるGIF画像｜無料GIF画像検索 GIFMAGAZINE 57081]

turn against (or turn someone against)

become (or cause someone to become) hostile toward:

〈人が〉〈人･物事〉を嫌いになる, 支持しない.

〈状況が〉Aにとって不利になり始める.

e.g. public opinion turned against him.