From watching Jane die to poisoning Brock, Walter White did some truly reprehensible things across the five seasons of Breaking Bad that made viewers fall out of love with him. When audiences were first introduced to Walt, he was a mild-mannered everyman: a husband, father, and high school chemistry teacher. He wasnt too far removed from Bryan Cranstons last major TV role Hal from Malcolm in the Middle except he was a much sadder version of that sitcom dad archetype. Naturally, audiences loved the character. But that all changed after he broke bad.

https://screenrant.com/breaking-bad-moments-stopped-loving-walter-white/