We’re not watching the rebels fight for their lives we’re watching a bunch of actors have a laugh about how crazy awesome it is to be in a Star Wars movie.
And really the issue here is not subverting expectations of plot (though that is still annoying) it’s subverting expectations of basic story flow. The movie includes too much
inappropriate bathos - continual breaks in mood. Always undercutting any serious situation with a joke. Would have been if Vader made a dad joke after telling Luke he was his father
It is an ironic detachment. Self-referential jokes made to excuse the fact that the story is poorly written. “Cant think of a better plot point than a giant space laser, again?