What makes you suspicious of other people?
I will assume here you are talking about strangers, and that in this context I'm encountering them unaccompanied by friends or acquaintances.
While my demeanour tends toward friendly and smiling, my first approach to judging everyone is to assume their alignment is true neutral until demonstrated otherwise. If they show even the slightest amount of aggression toward me or anyone else in close proximity, then further interaction is off the table and I will move away as quickly as possible. I'm also suspicious of unprovoked excessive concern, kindliness or attempts at physical closeness or contact. Experience has shown that this is just as worthy of suspicion, since it can often turn to aggression with very little notice, if rebuffed.
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