I think I may be the only one, but reading it, I thought Spielberg was disagreeing with Lucas.

First there was the "She'd better be over 22" line, which I interpreted as arguing with Lucas - "She had an affair with Indy 10 years ago? She'd better be over 22 then." I thought the "She came on to him" line was sarcasm - "Right, yeah, sure they had a consensual relationship when she was 12. In fact, she came on to him! Are you nuts?"

Then I read the comments here, and no one else read it that way. Tone is a tricky bastard.