> You understand that any visible intoxication is overserving a customer right?
No, it's not. Continued service of someone who is visibly intoxicated, however, is.
I understand the tenets of responsible service of alcohol, and that as a server, you are meant to stop service immediately at that point.
Realities, however, are more nuanced.
I teach new EMTs and paramedics, and one of the discussion points is around informed consent and implied consent. Every class has a scenario or two where a student inevitably says to or about a mock patient, "Well, you have been drinking alcohol so I have implied consent to treat you" or similar. "So, because he's had a drink, he can't refuse medical advice/treatment?" "Right."
"So I can go to a restaurant, have two glasses of red wine with dinner, and be legally allowed to drive a motor vehicle home, but not legally make decisions about my own health?"
RSA education is generally more black and white, but even with your comment above you show that it is easy to misinterpret. It is not a case of "if your customer is visibly intoxicated, then you overserved them", because they weren't intoxicated until that point (all else being equal, if someone sits on a bar stool and orders 4 shots of tequila to start and downs them all in front of you, then reasonability applies, of course).