How do physicists navigate disagreements between communities in their field?

Question

I came across the following post: https://www.quora.com/What-is-an-intuitive-explanation-of-Yang-Mills-theory The author of the first answer to the question seems to disagree a bit with the mainstream approach. How does someone (perhaps in grad or post grad) who's aspiring to be a physicist down the line navigate these kinds of disagreements? How does one with insufficient knowledge of the field know whether that post does or does not make sense? If there are several branches of research in the same area, how does one research which one seems the most promising? And as an aside, does the answer to the linked question sound reasonable?