I'm originally from east coast as a kid, but have traveled/lived extensively in Asia/EU for decades and have resided most of my adult life in CA/WA. I've been traveling to FL for almost 25 years to cave dive and last few years, since playing pool again have been to several medium/small towns in central/north FL playing pool. Gambling & socially smoking dope with strangers in bars and poolhalls is IMO part of the USA pool experience and was a mighty fine way to navigate Covid lockdowns
BTW, no one is telling the dude to not be safe - and I'm all for CCW/2A, but true ninja skills are situational awareness & social skills, and maybe a small but powerful LED flashlight (most practical/preferred weapon for all locations/scenarios). I'm thinking that anyone adventurous and well heeled enough to bounce from EU to US to bum around & play pool is plenty switched on enough to sort it out without safety lectures. To me you sound like a bit of a nervous nellie who watches too much CNN/Fox, but given that you're posting from FL, I'm guessing it's a generational/right-coast thing. And all the accent is going to do is make him a chick magnet, well that might cause some conflicts, but also part of the game!
Oh yeah, we all forgot the best and mandatory advice.
Playing Off the Rail is required reading, pre trip.
Peace and love