My opinion of this is, I don't feel better than anyone else. I'm not predjudiced against people because of skin color, intelligence, and all the usual things that are usually mentioned, or when they were born.
If time travel were really possible and we had a human from 10,000 years ago and 2,000 years ago and now and 2,000 years from now, of course there would be differences, but take them all at age 1 month and raise them together and I really doubt there would be much difference. Certainly not enought to for one to look down on another.
But that's not the comparison we're making. We *are*, in essence, comparing the respective civilizations and by nearly all respects our civilization today is better than the one that existed a few hundred years ago and a society a few hundred years from now very likely will be better than our current one.
Hell, we could make the argument our current society in America is better than the America that existed even 50 or 60 years ago. That long back black people were still struggling with Jim Crowe laws, segregation, sexism and so much else.
Today we have a black president as well as black people and women serving in public offices. Back then? Unheard of. Won't happen. No one will ever elect a woman or a black-man into an office, let alone president. Today? We have a black president. Make all of the claims you want, some of which may be founded, on the struggles Obama has faced as a president against members of Congress he's still a black-man (a mixed-race one at that) who's serving as the most powerful man in the world. That's quite the accomplishment for our society to have made when there's still people alive today from the segregation era.
No one's arguing that humans in the 24c are somehow biologically different than us today (well, on a minuscule level they technically are) of course of you took someone from the past or someone from the future and raised them today they'd come out different than they would have in their respective timeline. But only because they'd be brought up in an entirely different society and environment.
But, overall as a society we are better than our predecessors by a considerable margin and not just on a technological level. As a society we're better. Freedom, abolishing of slavery, equal rights, clothing and feeding as many people as we can, not huddled in huts giving most of our earnings to powerful leaders, all of that. As a society we're better.
As individuals, yeah, lots of problems there and there's certainly plenty of groups out there who're not much removed from the historical counterparts. But, overall, society is still largely better. That shouldn't be argued.