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Ethnocentrism means looking at the world through the lens of your own culture, and applying the specific values and judgements of your own culture when looking at others. We all do this to a certain extent, since how we see the world is shaped largely by our families and the culture that we grew up in. For example, someone who grew up in a liberal western society such as America would consider most Islamic cultures to be very restrictive of women, while someone from one of these cultures would consider American culture to be immoral in how permissive it is.
Is it wrong to be ethnocentric? Ideally, we would all try to understand other cultures from the inside before judging them. When you take the time to really understand another culture you can start to see that many practices are there for a reason, and make sense within the contexts that people live in. On the hand, trying too hard to not be ethnocentric makes you not have any moral values. There are many things, such as slavery, that should not be accepted no matter how rooted they are in another culture. So the ideal stance is to find a balance where we understand and accept other cultures on their own terms without sacrificing a sense of universal moral values.
Please let me know if you need any clarification. I'm always happy to answer your questions.
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