> learn the norms of what will be considered disrespectful in that context.
PG said "treating people with respect" which is not the opposite of disrespecting someone. To me, disrespect evokes a different concept, despite containing the same word root. When I say "treat someone with respect" it's not related to the old ideas out of antiquated honor cultures about formal honor or dishonor, where "disrespecting" someone is taken as an offense and affront to their legitimacy.
The modern concept of 'treating with respect' simply means initially engaging with people you don't know yet with a default neutral posture and general assumption of good will and good faith. To me, the opposite wouldn't be overt disrespect or insult but rather treating one kind of person I don't even know yet, any differently than I treat all the other people I don't even know yet. It's equal default treatment vs unequal default treatment.
Personally, if I'm a visitor to a foreign culture, I'm not overly concerned about the risk of accidentally offending someone over some local cultural norm. I've lived around the world immersed in several cultures different than my own and it's never been a problem. My good will, good faith and sincere best efforts have always been sufficient to form new and lasting friendships, even when I've unknowingly committed some unintentional faux pas.