I learned that both exist in school in France. It doesn't matter, I write both interchangeably and nobody ever cared nor corrected me.

Yes, we also had lessons about the differences between BE and AE so we are aware of both, it is just that when Brian was in the kitchen, he was asking about the colour of something.

The reference to Brian being in the kitchen is understandable only for Gen X in France. (https://fr.wikipedia.org/wiki/Where_is_Brian%3F, only in French unfortunately but you also have https://youtu.be/11jG7lkwDwU?si=gQoVL_AmBfQMrZbX&t=57)