[quote=@mdk]
Mental Apartheid? Political segregation? 
[/quote]

Sure, except me choosing not to spend time with someone, or to pursue a personal connection with someone, is hardly a systemic system of oppression. I certainly have plenty of friends and acquaintances with whom I don't see exactly eye to eye. It is certainly possible to agree to disagree, but there are position which I would consider not just wrong but immoral. Racism springs to mind as do things like sexism and homophobia. If someone expresses such an opinion, it doesn't seem like tolerating that person in my life is morally acceptable or at least not morally consistent. 


[quote=@mdk]
the average person is not better than everybody else they meet, and thus the average person should probably think twice about playing the arbiter of civilizational morality.
[/quote]

I'm not arbitrating for civilization, I'm arbitrating for my own life. It is entirely possible that the shoe could be on the other foot and people might make the same judgment about me. That is entirely their choice.