I have to admit, I don’t recall a man ever offering me his bar stool, mostly because I don’t frequent bars. I don’t think I’ve ever gone into one unescorted. Of course, I was under the legal drinking age when I got married. :)
I live in Palm Beach County as well. I like to think that I am at least as chivalrous as any of my contemporaries. You will note that the two guys in question were handed a menu which they were pondering. I would not give up my seat to anyone so they could sit while I tried to eat standing up.