I have a stand-up display on my table with some basic rules, the guest Wi-Fi, how to get music, etc.
On them clearly states, "If you can't look it up in the rulebook, it's not a rule. There are two copies of the rules here and internet available. This is not Billy's Bar and there are no bar rules."
On the subject of playing in a bar; if I ever do it, and have to play safe, I just call a random pocket and lay the safe knowing it's not going near that hole. I have heard a few color phrases about safeties, but that tells me more about the person and how to beat them. Names like, "granny stick", and, "***** stick", are also dead giveaways.
Now, just a caution if you do find yourself playing in a bar, watch for people who use the RAM SHOT on the break. They're hustlers. A real bad sort, them-un's are.