Translation: I am a normal person, and I'm non-judgmental for the most part. I don't usually judge people. Crazy people quickly notice the quality of being non-judgmental in normal people.
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sb70012wild unknown menI believe the author is using 'wild' to mean 'abnormal' or 'crazy', and he's using 'unknown' to mean that most people didn't really know much about them. They were unknown, and their wildness (craziness) was also unknown, to just about everybody (except to the author, of course).