Friends Season 04 Episode 01 After Ross and Rachel quarreled, why did Chandler say I know?

Chandler is talking. I knew it.

Did you notice Rachel's last words before slamming the door?

"Hey, you know, it's not common. Not every man does. It's a big deal!"

Before returning to the quarrel, the two snuggled together, indicating that they had just finished rolling the sheets.

And according to what she said, we can boldly speculate that:

Ross must have let it out just now, and then she comforted her boyfriend and said, Oh, it's normal, everyone will be happy, and it's no big deal. Oh, it's normal. Every man will have this time. It's no big deal.

So, in the quarrel, what she said was denying what she had just comforted Ross.

Then Chandler listened and understood. He immediately remembered that something similar had happened to him, and the woman comforted him in the same way. At that time, he felt that the woman didn't really say that. When Rachel said this, he immediately said, I knew it! I already know (that's what women think)!

Hope to adopt!