Well, I don't think there's a color I dislike, but over the years I have heard more people say they really dislike bright yellow. For some reason, old Musclecars, in the hands of guys that don't care about originality, seem to end up day-glow yellow, usually with black stripes or black top.
As for factory colors, Butternut Yellow is not one of my favorites. It's not ugly by any means, just not a fan of it on a Musclecar.
And Sublime...yes....