opinionated guy in work

[Pyrrho]

He is an idiot.  Not only does he believe a good deal of nonsense, you know engaging him in intelligent conversation is a waste of time (from your attempt to do so regarding slavery).

Also, judging from the family values drivel, he sounds like he is likely a religious nutjob as well.  So I recommend never bringing up the subject of religion with him.  Or, for that matter, talking with him at all, beyond what is absolutely necessary for your job.

If he is actually shouting, what does his boss think of him doing that?  Why is he allowed to shout in the workplace?

[Aoi Magi]

I generally bring out my psycho-grin smile and stare them right between their brows, usually shuts up these sort of people within 10secs.

[Brian37]

Conspiracy nut. If he thinks NK is such a free country tell him to move there.

[Whateverist]

Cover your ears, close your eyes, start swaying gently back and forth and scream on the top of your lungs

At least that's how I deal with people I don't like ¯\_(ツ)_/¯

Gotta try that:

-\_(; ..... =(

How'd you do that?

[downbeatplumb]

I will also spill my political opinions at the drop of a hat. (or more likely the raising of a glass).
But I at least know something about the subject.

There are some people who think that opinions are the same as facts.

[Longhorn]

Cover your ears, close your eyes, start swaying gently back and forth and scream on the top of your lungs

At least that's how I deal with people I don't like ¯\_(ツ)_/¯

Gotta try that:

-\_(; ..... =(

How'd you do that?

It's very simple, just [REDACTED] the [REDACTED] and then [REDACTED]

[brewer]

Tell him you consider it offensive and/or consider it work place harassment. See what his reaction is.

[Iroscato]

Cover your ears, close your eyes, start swaying gently back and forth and scream on the top of your lungs

At least that's how I deal with people I don't like ¯\_(ツ)_/¯

Gotta try that:

-\_(; ..... =(

How'd you do that?

Highlight ¯\_(ツ)_/¯
Copy ¯\_(ツ)_/¯
Paste ¯\_(ツ)_/¯
?????
Profit.