You can still have chemistry on screen without getting on with the person. But it just makes your job a lot easier if you don't have to gird your loins, if that's not quite the right phrase, every time you're going to do a scene with that person.
“Anything that won't sell, I don't want to invent. Its sale is proof of utility, and utility is success.”
“The reason I formed my own band in the first place is so that I could step up as the singer.”