If you’re in a relationship, a male coworker who is attracted to you might make disparaging remarks about your partner—like jokes about how he might be in bed, and things like that. You can tell him that that’s really not okay, and that the topic of your partner is not on the table here.
If all she brings to the table is negativity, all she mentions are problems, and all she does is complain, you can tell her that if she’d like to be reassigned to another project, since she seems to find this one unmanageable (a nice little dig suggesting her skills are lacking) she’s welcome to move to another team. That reframes the idea of her moving to another project as her failing, which she doesn’t want to do.
If a project must be broken up into several tasks, with each task requiring a different number of people, you’re always assigned the one-person task.
Even if you love your job 100 percent, that doesn't mean you love your co-workers the same.