Think like an anti, etc.
In real life, my "official" stance is that I am an anti. One thing or another led me to needing to take that position with almost everyone I talk to IRL, and even on many places on the Internetz.
I've had friends who probably think I would kill pedophiles if I could.
No one will suspect you of anything if you're acting exactly how an anti would.
A few years ago I did something a bit odd, but nothing anywhere close to illegal. I'm still a bit paranoid about what the girl's relative may have thought. But since then, she's even invited me over to her house, where the girls were sleeping, and even tried to set me up more or less with an adult woman she knows. And more.
So I take it I did NOT come across as creepy. But who knows. Most women and mothers around me seem to think I'm great and sweet with their children, even if I'm a bit of a strange guy. ;-)