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.
“Between his eyes, there were four lines, the marks of such misery as children should never feel. He spoke with that wonderful whisky voice that so many Spanish children have, and he was a tough and entire little boy.”
“I've spent my whole life in Chicago being asked where am I from, so that I have a sense of displacement that also is very psychologically disorienting.”