Code of conducts are a response to the democratization and increased accessibility of software development. Like in other communities, as the number of collaborators increases and the number of personalities, behaviors, backgrounds, and ideologies intersect, the chance of disagreements goes up.

Code of conducts are a sane effort to highlight behavior that won't be tolerated, such that it's written down and no longer implicit.

That being said, one is free to disagree with the content of a particular code of conduct if the content does not appeal, but a mere presence of one should not result in becoming dismissive of a project.