I can't really think of anyone that I would write a negative recommendation for. I just think that's wrong.....let them sabotage their own career. If they are bad enough to write a bad rec., they will screw themselves at some point. I just don't believe in doing that.
I've been pretty lucky in that most of the people that have asked me for a rec. have been people I had no problem with recommending. The few that I really didn't want to do one for, I just told them to write their own and send it to me. Most of the reason I don't really want to write them a rec. is because they are unmotivated and lazy anyways....so guess what? They never send me back the completed rec........problem solved. The few that I know that I would NEVER in a million years write a rec. for know better than to ask me for one. They are the non standard cocky ones that I've had to chew out when I was a regional captain. I think if they called, I would laugh.