I find it really creepy when a guy sneaks up behind me and drafts me when I'm cycling. It's just as creepy as when a guy walks right directly behind me, almost stepping on my heels.
1) I am a woman
2) I'm one of the slower riders you'll find ... so why draft me?
I tend to slow down even more to see if he'll go around. I have also suddenly turned an intersection or pulled off into a service station or something.