I have to say something about Jews behaving in public. As long as I have been educated, I have been given two reasons for this. The first is that people look at Jewish people as if to expect something better; as if they represent a higher authority. This version plays well into the Chillul Hashem concept. The second reason is that the world hates Jews and it is up to us to change the perception of that. Public image is everything.
Here's my issue: Do others really have that perception of us? Do people who don't believe in our religion (and in fact may think we are wrong altogether) think that we represent G-d? Do they believe that we are a people who are better than they are in that regard?
If you are going to say that the reason to behave in public is that they hate us and are looking for more reasons to hate us, is THAT really true? Do you think we are hated more than any other minority in the world? Do you think Muslims don't tell their children the same thing: "the world hates us, so don't give them more of a reason to." Bill Cosby is always griping that this is why black people are hated. Are we more hated than they are?
This all came about because of a recent story that a friend of mine told me. She is a waitress at a semi-fancy restaurant. One day, a pair of frum mothers came in with their rambunctious children to have lunch. The children (there were seven between them) were running around the restaurant while the mothers were complaining about the service, why it was taking so long to deliver the simple food they had ordered and why the waitress was taking care of other tables before their food was delivered.
Obviously, this is not proper behavior for anyone, but what I didn't understand is why my friend kept hitting on the fact that these were frum women who represent an entire nation and are being judged by the gentile staff. The whole time she was telling me this story I was thinking "Hello! Haven't you ever seen movies or watched TV shows or heard news stories or listened to stand-up comedy that hits on this very topic?" It's not that people are judging frum Jews (or Jewesses in this case). They are complaining about obnoxious customers who need to have anything they want. After all, they are paying.
I just tend to think that people get too carried away in what they represent. Stop thinking that you have to behave well because you are representing a larger group. Be a decent person because you are representing yourself, and if you don't have the self-respect necessary to that, well then maybe you shouldn't venture outside the confines of your own home.