Hmm.
Mostly I see people, IRL, as objects. They're basically furniture to me until they speak to me. Sometimes even then they are regarded as furniture. I simply don't want to talk, so I simply do not. It's just not within me at that moment. Other times, I do fine.
Now I mention that because how I feel at a particular moment is what my tolerance hinges on. If I'm feeling particularly receptive to the human race at a given moment, I can accept differences. What I am deeply troubled by is contradiction, stupidity, extreme viewpoints (particularly right wingers), extremely religious people who feel the need to force their beliefs on me or incessantly talk of them in my presence, and people who are not in touch with reality (i.e. smokers who think cigarettes aren't dangerous, so they smoke around their kids, etc.).
Otherwise, I tolerate most differences as-needed.
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They tell me I think too much. I tell them they don't think enough.