In the Bhagavad Gita, Krishna talks much about duty and freedom from attachment to fruits of labor. Perhaps one such place where we can implement this idea is in the department of disagreement. In this day of social media, practically everyone has access to an audience and practically everyone has an opinion. Nothing wrong with that! Srila Prabhupada says where there are two people, there can be disagreement. In other words, as meager as two people can disagree what to then speak of a bigger group or an institution or community etc.
There is disagreement in the Bhagavatam. Divine and exalted souls, we read, disagree and put forth opposing views in the presence of the Supreme Being. Certainly, therefore we can conclude,agreeing or disagreeing is within our domain. The problem with kali yuga disagreement is it comes with a selfish agenda of some sort. In other words, we disagree when our agenda is under threat or when we feel my thoughts or I will not be given importance. Such disagreement invariably will lead to discord and fight. However, if we disagree with someone or some principle according to the conclusion/essence of the shastra/guru vakya (not selfish) and satisfied with what Krishna provides, such disagreement will not create bitterness in our heart.
If we do have bitterness, it is a sign that we are doing this for something selfish and that it is time for introspection!