"One thing that often surprises people about the social rules is that we expect people to break them from time to time."

Sounds like there's plenty of room for nuance. They're guidelines. That you spent several paragraphs considering and articulating the difference between a positive social interaction and a negative one means the guideline is probably a good one, even if they didn't bother to write several paragraphs of nuance for each point themselves (which is perfectly reasonable, because brevity has its own value).

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Rate-limit edit:

> That they haven't done so in 15+ years suggests that they think the rule is well-written.

Or it suggests they know more about what social problems actually arise in their community. Your 'vastly better' suggestion of "Don't be a dick" is so vague as to be a completely meaningless guideline, and someone reading that could easily end up doing the condescending surprise act without thinking they're a dick. The purpose of the rule is to call attention to a specific behavior they likely see often to make you think twice about it.