But it can be more or less wrong in specific circumstances.
You seem pretty sure that your opinions and actions will stand the test of time, just like countless people were in the past. So sure that now we are right, and amazed how they could be so wrong.
Well, I don't know the future, but see you in 30 years. Let's see what moral fashion will rule those times. Be prepared to be judged.
I know my use of technology built in unethical conditions will be judged poorly, so I get the most out of tech and try to be pick the best companies to buy from when replacing it.
I know my difficulty moving past the gender binary will be judged poorly, so I learn about non-binary genders and people who exist outside gender entirely.
I know my past homophobia--even the internalized variety--will be judged poorly.
The list could go on for a long time, but the important thing is that I see where I fail and try to fix it. Supporters of discrimination are just as capable as I am of seeing past their failings. They choose not to.
Eich had his chance. He declined and ran away instead.