I'm 6'1", 160 pounds, 40 year old man, so I'm probably not perceived to be either an easy victim or a threat to others. That said, I never volunteer information about my whereabouts unless I've gotten to know someone reasonably well and I'm always vague about goals for the day, where I'm planning to camp, and who I'm with. But I try not to be so paranoid that I cannot enjoy conversations with the occasional eccentric person. I never ask a solo hiker, either male or female, if they are solo and I usually won't ask where someone is heading for the night. I've only had a couple of encounters on the AT that seemed a bit off, one of which involved someone who I'm pretty sure was homeless and living near a shelter, and he was probably harmless.