If you’ve spent some time outside of the west, and what the west conceives as “comparable with the west”, you’ll find that there are many cultures that are what you describe as “evil”.
And, for example, when you encounter things like Afghanistan's "dancing boys" (fathers literally sell their sons to powerful men as sex toys), are you inclined to shrug your shoulders and look the other way at such "cultural differences"?
Yes, there are many things that are accepted in other cultures as normal that I am happy to condemn. If you can't find it in you to condemn at least some of them, then I think that there is something wrong with you.
I've personally witnessed these "dancing boys" in Afghanistan, and no I didn't shrug my shoulders. I'm not sure why you think I disagree with you. I'm pointing out that this insistence on the principle of "equality of culture" is a western proclivity that is both naive and wrong.
Note that I don’t disagree with you in general. I’m no cultural relativist. I just think the post-1960s individualist secular liberalism is a civilizational dead end that’s already correcting itself.