How do you see your world? Have you ever thought about this? Have you contemplated why someone from a different culture may see their world differently than yourself? Or even someone from your own culture that you know has different views?
While that person may want the same good, inherent aspects in their life, that allows them to live a good life, they have been conditioned by family, culture, society, etc. to 'see' their world a little differently. The same exists for anyone from anywhere. Understanding 'bias' beliefs opens us to happiness in a way maybe not previously contemplated.
When we are able to understand why it is that another may do what they do, especially something that doesn't 'seem' right to yourself, you have opened your mind to a number of positive life factors. In particular, no requirement to judge, as long as the practice of the other is not truly harming.
It helps too, that when one visits or relocates to a new culture, like a new country for instance, that one at least somewhat conforms to the established culture. It is okay to still follow your own culture. The new culture though, is where you are trying to root yourself, or someone else is trying to root themselves in yours.
To do this, it helps to recognize and remove our beliefs and bias's. At the least, temporarily. If what we think, speak and act in ways that lead to the betterment of everyone involved, we improve and exist in a state of happiness based on reality.
For instance everyone has a right to practice the religion of their choice -as long as it doesn't harm others at all. Everyone has a right to go about their country, in public places, without fear of harassment of any sort. No harassment from government nor individuals or groups.
When it comes to dealing with people individually it helps to understand that they may 'think' what they think due to the nature of their conditioning. Often, overweight people are the way they are because they may have been abused at a previous point in their lives. They have let themselves go, make themselves unattractive, because they don't want to be touched again by the abuser.
So, try not to judge. Or, just don't judge. Instead understand the bias, understand your own bias. Let it go, may be a better way. Unless of course, the situation is truly dire, and change is required. The deep contemplation of understanding bias, how it impacts us, opens up our hearts to happiness in a way that may not have been previously understood.