All bets are off when you're not on home turf. Understanding and opinions of how to interact with and treat people of different races/ethnicities are at remarkably different stages of development around the world because not everywhere has the same levels of immigration and immigrants and so they just haven't spent time thinking about there things and in some cases consider them completely non-existant issues.
I find it helpful to perform the thought experiment of taking any person of any nationality and dropping them into any other nation randomly and have them try to assimilate into society and imagine the challenges they might face and the treatment they might receive. Some situations fare better than others when I try to imagine this but suffice to say, the more homogenous the population and the less of your specific kind are visible in society the harder a time you have.
The tribalism is real.