Yeah, you're given a few opportunities to be a creep early on. Honestly, I kinda see how some might see the dark route or even the corruption route to some extent as feeling at odds with the Guy that we're presented. But, keep in mind that we're only given brief glimpses into his thoughts, and there's a lot of room for his behavior to be interpreted differently from how it seems at face value. Haven't we all seen firsthand someone do a complete 180 on how they presented themselves? Hell, I've done the same to others... we all wear masks at one time or another.
So, just imagine that the Guy you're playing is a pseudo-first-person PC, and you can't necessarily read his motives for every action.