[lhnn]

As someone who does go to parties, if some girl were sitting in laps and laying across people, etc., she should not be surprised if a guy makes a move.

Now, the guy should have known she was probably not specifically interested in him, since she was sitting in EVERYONE'S lap (this is analogous to other things a man or woman can do with everybody...)

And, as you mentioned, he had no right or logical reason to make the move down south. If someone did that at a party I was at to one of my female friends, he'd get socked in the face and thrown on the concrete.

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In short, you're absolutely right, IMO.