Well yes, you are right, she seems petty and aggresive and yes she would probably treat differently some guys from the US or another country, just because then she would be able to have in mind the "comforting" thought that this is not happening somewhere close to her. However I personally can justify her reaction in a way. She lives in a country where a single smile is considered a green light for sex, a publicly breast feeding mother is considered an exhibitionist and the view of a topless woman on the beach causes great discomfort to some and even greater erection to others. Although I don't quite unserstand what is the exact reason these guys are doing this or what inner need they are trying to satisfy , I have no choice but to respect their way of living as I don't see it can harm me or others in any way. However I know that Greece is far from being able to accept this and both of the guys know it too. I would be more pro their urban nudism actions if they would be entirely not ashamed of what they are doing and if they would stand up for their way of living with more courage. The quick awkward walk through some crowded tables just shows that them alone don't know exactly what's the point of doing it and that they don't feel entirely comfortable with it although they are trying to convince us that they totally do.