I started writing this and then noticed that it usually depends on the setting and situation.

The first situation is the individual interaction. An example would be a person telling another person in public that they might be doing something against the law/wrong.

- Arab Israelis to arab israelis: this basically never happens. If you do this, you will probably be called a smartass and people will mock you. It gets worse if you take the fact that in an arabic city in israel, everyone knows everyone. Some people take your note as a personal attack and it can snowball into something much bigger than you expected.

- Arab israelis towards other israelis: very little speaking up. Arabs don't bother doing it because they know they might lose most of the time. There is a lot of racism and class-thinking in Israel. The minority keeps quiet in fear of waking the lion up.

- Non-arabi israelis to other non-arab israelis: Speak out. The cities are larger, people in public are actual strangers and not relatives or people you know. Speaking up usually goes in a neutral or rather negative way. I cannot recall a situation where the intention of speaking out was to educate but rather to show that the one speaking out is in the right and the people accepting the critique is in wrong. Usually leads to arguments which are pretty loud.

- Non-arab israelis to arab israelis: much easier to speak out. We are a minority, it is easy to speak out against a minority, specially if in the current public situation (jewish city) you are a minority.

- Germans in general: rather passive until they are personally affected by the actions of another person. Then they speak out. Here again, not with an educational intent but rather snappy.

- Germans toward german turks: no more speaking out than usual. They complain a lot about the turkish minority but do not confront directly.

- German turks: I do not speak turkish, which makes this part hard as german turks usually prefer talking in turkish than in german. This is actually something that is discussed a lot in the german society.

This is different when it comes to group interactions. An example would be something that is happening in the bus where everyone is listening/watching what is happening and it is about doing something or reacting to the situation.

- Germany: it usually takes some time until someone dares to say something. Usually it is the younger generation saying/doing something about a situation. Once somebody starts, many people try to pick a side and just jump on the bandwagon, sometimes without really realizing what they have just subscribed to.

- Israel: Pretty fast and loud. Bandwagoning happens here too, but people are more aware of their opinions.

In both situations, group interactions in Israel and Germany are usually initiated by people from the ethnic majority in the situation. In a situation where there are 8 jewish and 2 arab israelis on a bus, the "speaking out" is usually initiated by the jewish fraction in this situation. While it might be just a matter of statistics (8 vs. 2) but there are additional factors that go into this. The ethnic background surely plays a role here as the two arabic passengers feel that whatever they might say will be ignored or countered because of the fact that they are arabs, without taking into account if what they are saying is right or wrong.

I might be very vague in my descriptions or not know the correct terminology for such situations. A social scholar or anthropologist might be able to make more sense into this situation??

Keep in mind, everything I wrote is taken from situations I have encountered myself and probably is heavily influenced by socio-economic-ethnic-bias and might be far from the statistical reality, so take it with a grain of salt.