'You're a creepy psycho' message in GTAV?
Rockstar has a tendency to give NPCs very random quotes that you wouldn't expect them to have included, just to add a bit of humour in some cases, and in some to give a realistic response to what's going on.
Most notably, I've had moments where I'll drive past some people with a prostitute in my car (dat health regen) and I'll hear something along the lines of "You're a creep!" or "Pervert!"
I think this is being read into a little much, as if it were truly something you would have found a concrete answer somewhere on google, given how long it's already been out.