Characters
It's the non-relationship drink of choice. It's not a date, it's a caffeinated beverage. Okay, sure, it's hot and bitter like a relationship that way, but...
— Willow

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker insists that the drink is a casual non-relationship choice, just a caffeinated beverage rather than a date. Yet by conceding that it is hot and bitter, like a relationship, they half-undercut their own denial with a wry, slightly defensive humour.
Context reviewed