Why do they laugh when Rose Maxon says these words?

In one scene of Fences, They all laugh in this scene when Rose Maxon says these words:

Man, hush your mouth. You ain't say no such thing. Talkin' about, "Baby, you know you'll always be number one with me."

What is so funny in these words?

Best Answer

As I remember Troy was explaining how he conquered Rose. I don't remember the exact words they used in the scene, but was something in these lines:

Troy explaining what Rose and him said in the night they met:

Rose: What will be number one for you, baiseball or me?

Troy: You know it will baiseball, but if you work on it, you can get close.

Then Rose said the phrase you mention on your question, basically telling it was a lie, that Troy was crawling for her:

Baby, you know you'll always be number one with me.

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