Generally speaking, the phrase "That's easy for you to say" is used when one needs to say that things aren't as simple for him as some other person suggests. The definition clearly suggests there's a dismissive tone to the phrase.

But what about the following dialogue, I don't quite get how they've used it here;

[A little bit of a backstory first, There's this guy who's got quite a reputation amongst girls and many guys look upto him for his confidence.]

Now, he is walking with a girl, and the following dialogue takes place,

Guy: So, I was thinking we should have a dinner date at that new diner, Dinner. (Dinner is the name of the diner he just mentioned)

Girl: That's easy for you to say...(Then they both laugh)

I don't really understand its usage here, and if the phrase is used dismissively then why is it paired with humour?

Thank You for Your Answers!

Generally speaking, the phrase "That's easy for you to say" is used when one needs to say that things aren't as simple for him as some other person suggests. The definition clearly suggests there's a dismissive tone to the phrase.

But what about the following dialogue, I don't quite get how they've used it here;

[A little bit of a backstory first, There's this guy who's got quite a reputation amongst girls and many guys look upto him for his confidence.]

Now, he is walking with a girl, and the following dialogue takes place,

Guy: So, I was thinking we should have a dinner date at that new diner, Dinner.

(Dinner is the name of the diner he just mentioned)

Girl: That's easy for you to say...(Then they both laugh)

I don't really understand its usage here, and if the phrase is used dismissively then why is it paired with humour?

Thank You for Your Answers!