The thing that makes him most hateable is that there are things about public health that most of us in mainstream healthcare agree with him about. The US food supply is a mess. People are not active enough. Everything that ails you cannot be fixed with a pill. People should be involved in their own health.
Instead of building on those areas of agreement, he went right for the BS crap like vaccines, seed oil/tallow, fluoride, food dyes* etc. He wants to prove he can win battles more than he wants to improve health.
*no, I don't think food dyes are likely healthy. But, their input in our health issues is miniscule vs the other stuff.