Its more of a common courtesy than a rule. We like our personal space, take up both armrests, just plain not having to worry about anyone else next to us. Only reason it doesn't apply to girls is because another part of our anatomy takes over and overrides those thoughts.
Personally, I would've been freaked the hell out just because of the weirdness of the situation, and if you're near the center anyone, one seat doesn't matter near enough for something like crowding in on people.
And as for the urinal space rule, its just something you witness and learn growing up. Except for dire situations, you wait in line rather than use adjacent urinals. In a three-urinal bathroom, this usually results in only the outer two urinals being used the huge majority of the time.
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...And then I found $5!
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