Don Durito
Hero
Well yes of course you do, but that's orthogonal, and not at all relevant to what I said which was merely responding to lazy appeals to authority.You listen to those who say it is, consider their perspective as empathetically as possible, and consider the impact that changing the behavior in question will have on you, on them, and on those who don’t consider it a problem. I find that more often than not, a thing that has little to no impact on my life and the lives of those who don’t care about the subject can have a huge impact on the lives of those who do. Not always, but often.
If you're friend says X is offensive to them you listen to their reasons and consider them. You should of course listen emphathetically but you are not 100% bound to consider they are right. You don't entirely abandon your own reason.
And if a third party asks why X is offensive, you need to explain your friends reasons, not say "My friend is Asian and he says it's offensive so...".
If nothing else, weak appeals to authority are counterproductive.