Use basic French manners—always say bonjour, use s'il vous plaît and merci, respect dining pace, and favor local transit to blend in and avoid hassles.
Are you a perfect modern gentleman? Not if you run in public or wear a tank top to the gym
A modern gentleman combines timeless manners, efficient un-fussy behavior, respect for service staff, culinary skill with eggs, punctuality, tasteful attire, and restrained public conduct.
If AI becomes more widespread in commercial use, and I have little doubt of it, I'll likely keep these reflexes, especially in situations that normally involve human interaction.
Pope Francis exemplified perfect manners and grace during his visit to Azerbaijan despite cultural challenges and hostility from local Orthodox groups.