I don't follow? Maybe try rephrasing?
> can be a racist / homophobe in secret
I can kind of see that, but, the KKK wears hoods?
> I don't see a justification for spying on a co-worker
Hmm. I don't have an examined opinion on this, outside of general hesitation to go looking for problems for reasons such as confirmation bias and whatever the name is for what self-fulfilling-prophecies looks like this in kind of situation. Well, and maybe that if you're looking for justification you've already messed up. Just because you can somehow find a consolation prize doesn't mean you should have done something in the first pace.
Edit: You don't need to tolerate bad behavior, but it goes both ways: You can't justify bad behavior in the name of policing other peoples' dumb actions.
Or: Two wrongs don't make a right.
How do you differentiate between "biases" and "legitimate disagreement"?
I do it by exploring how much attention someone's paid to they path they took to where they are. Biases generally present as short, unexamined paths.
> Or: Two wrongs don't make a right.
I would agree. Too much of justice is about negative incentives.
If you have the time, I suggest reading "They Thought they Were Free," by Milton Meyer. It's a well-known book that tries to answer why generally "good" people joined or supported the Nazi party in pre-WWII Germany.
It's been about a decade since I last read it, but I keep it on my shelf. What I remember, though, is that the reasons why Germans joined or supported the Nazi party vary quite greatly. I remember one passage about a man who basically liked dressing up in Nazi uniforms because he loved pageantry of Nazi rallies. Another was about some Jewish children who saw a Hitler Youth parade in a movie theater newsreel, and really wanted to join.
It's well worth the read if you need to understand why hate groups are so attractive to some people. (Or, to basically "examine your biases" towards people who you have "legitimate disagreement")
That said, as legit as your recommendations are, I don't see how this answers my question:
How do you differentiate between biased and legitimate disagreement?
Neutral 3rd party?
But then how do you know the party is neutral?
That might be the culture I come from, but it is not my culture, and I do not subscribe to it, claim responsibility for it, or claim ownership of it.
Then again, there's not a lot of people in my culture, they're pretty spread out, and it's hard to get them together in one place to do our thing, soooo.
America is a lot of different cultures. Most places are. https://tvtropes.org/pmwiki/pmwiki.php/Main/PlanetOfHats
For example, do you think that we should force Muslim Imams to wed gay couples? I believe that it would be a fairly controversial topic even in left-wing circles.
It's a complicated subject.
IMO, I don't see how someone can be a racist / homophobe in secret; thus I don't see a justification for spying on a co-worker just to find out things like this.