How is trying to stay on topic "nitpicking the definition of drafting"? I also like how you're ignoring every single other counterpoint.

Seriously, some of you guys need to relax and realize that most people aren't intending to infringe upon your sacred holy bubble of personal space. All it takes is a "Ahem, I'd appreciate if you didn't draft off of me," and most reasonable people will say something along the lines of "My bad" and back off. Getting all offended and angry about it just makes your day worse and turns you passive aggressive on the road and trail.