What is stylised dialogue?

Stylised dialogue is how a writer writes his script. For example if you were writing for a film in the Victorian era then you would write in language similar to Shakespeare. Whatever film you're writing about, the dialogue has to fit with the time and genre as 'genre changes over time'. Examples of stylised dialogue writers would be:

Hal Hartley (right) is best known for the characters he creates which are notable for deadpan humour and offbeat characters quoting philosophical dialogue. This is his stylistic dialogue and the way he writes. 

David Mamet (left) is best known for his fast, clever and edgy writing styles that often fit with his characters that are tough and get what they want by controlling each other. Such as interrupting each other and swearing. It also fits in with the time and genre of his films.