someone enters into some bikers bar (or something else like this) and all of the men inside are ready to beat him! I wondered is it often over there?
This depends on a lot of things. Keep in mind that movies for the most part aren't really accurate for what happens in life or the way it happens. That said, there are some places that are clannish or favor the locals with a better approval than an outsider.
Where my home is, there are a lot of little coastal towns. Many of them with one bridge in and the same for getting out. You come and leave by the same way. One of my brothers knowing this and the rivalry between local areas, invited one of his military buddies to go on a planned excursion to rile the locals. They went into the local bars, drank, and bad mouthed the locals. Nothing happened to them in the bars.
On the way home, when they got to that one bridge, there was a welcoming committee waiting on them. I mean to say they were really glad to see my bother and his friend show up. But what they had planned was not so friendly. They had in mind a fight to teach the outsiders better manners.
What I haven't told you in this story is the military friend was a hand to hand combat expert. The meeting on the bridge was expected before they came to town. So they baited the locals into sending their best into a fight rather than a gang. Then the friend promptly beat the crap out of the guy.
After that, everyone decided to call it a night and leave well enough alone. This is an exception to the rule as far as how things are in most places and my brother went in to purposely stir up crap. They came looking to make trouble and it found them.
On the other side of the coin, I'm not much of a trouble maker really. I've been in some seedy places without ever having any problems at all. One bar I went in while I was in the military, as a friend and I walked in to get a beer, two others were headed out the door to have a fight outside. A beer bottle sailed passed us to hit the door frame. Yet we had no problems at all as we were not looking for any trouble.
My point being it is what you make of it. If you are looking for trouble it will find you.
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Which American film shows your contemporary life in a most realistic way?
I don't know that there is one. Please keep in mind that they don't make movies about things that are just ordinary, everyday, life as those are rarely exciting enough to make a movie over.
Another is that I would be a very poor judge to pick such a film. I rarely watch movies and never watch TV. So my choices to give you aren't really much to pick from and those I know just don't seem to fit a laid back life style where exciting things rarely happen. I mean we talk about the dogs barked. That's not exciting. Mowing the grass isn't a deal to make something over. Sitting out grilling outside or setting up the smoker for a long smoke of meat instead of a grill is not really something that you'd normally talk about either.
Basically I live in a one horse town the horse got up and left. Not much excitement, not much unusual goes on. Certainly nothing like you see in the movies would remotely fit from those I know of.