Modern Commentary
There's a balcony, so at least one side of the apartment is above ground level.
Also, that's kind of a mean joke from Kimberly. Dude just lost everything. He's just starting to get it back. Maybe the idea of losing it again is a sore spot.
But, y'know, boundaries are being re-discovered. She wouldn't be the first person to try for playfully mean and perhaps overshoot. - Terrence