Nah, there’s no self deprecation in that. It’s more like they’re just rationalizing their shitty behavior ahead of time by pretending they have a characteristic that’s entirely out of their control.
“Sorry I’m just [choosing to be] a bitch” is more accurate.
Worked with a couple people over the years who straight out said they are hard to deal with. Had much less problems with them than those who said "they could work with anyone"