I think the weirdest i got was "nope I'm mean"
Though not a rejection yet, there was a girl who messaged me today asking to cyber, and when i replied with "hello, how are you" thinking it was a joke, she said "i was joking thats gross"
Not entirely sure how a simple hello is gross, but i think she was just trolling.
I think the most amusing I rejected was a "straight" guy who apparently thought i was attractive despite his profile indicating a very poor view of bi/gay people and non monogamy.... no, you either lied to me or on your profile, liars are no good.