The best/worse rejection I ever got was from an agent who already rep. Me. I sent her my 2nd project, while she was getting my first project ready for sub.She said the 2nd project was so bad, she couldn't get finish it.
Ouch.
But I sucked it up and said "ok, well let's talk about the first project. the one u love. Are you done looking it over? We are two weeks past the deadline"
she said
"Well, I was so hurt by how bad the 2nd book was, I was too emotional to finish working on the first book. The one I really love"
Seriously?
That sucks. Well, I suppose if you had stuck with her, she wouldn't have the enthusiasm that you deserve for your work.