It happens very rarely that there's someone I don't like as a person but I know they're competent in their domain. Sure, it does happen, but it's very rare.
For real? I’ve known all sorts of brilliant bastards. Or even people who weren’t actually jerks, just incompatible with me in an oil and water sort of way, like they were exceedingly uptight, or so happy-go-lucky that they thought I was the uptight one. We just didn’t get along at all, but they weren’t bad people, and certainly not incompetent, just not a good pairing with me.